I tried this with a deeply discharged 496 battery. I was able to do it without opening the case. The initial battery reading before charging was between .5 V and .6V on the two positive terminals. I made two wire loops from safety wire and attached the loops to alligator clips and then duct taped them to the left hand terminal (-) and the far right hand terminal (+) the other end of the alligator clips were attached to a new 9 volt battery. I took approximately 6 hours to get the battery to a charge level of 5.4 volts. After that I charged it in the 496 overnight and it was now fully charged. I plan to discharge it to the 50% level and then recharge again. We shall see how it holds up. Thank very much for the video and inspiration to do this.
David, Thanks for your recommendation. I tried your method last night on a battery that had sat for 7 years and it worked perfectly. Like a jump start.
I have recovered the battery without opening it up, as others have commented here. I used the outer terminals, identified the positive and negative with a multimeter - for me, with the battery oriented with the printing rightside up, the left was the negative and the right one the positive. I had about 1V in the garmin battery. With wire I connected the positive terminal of a 9V battery to the positive of the Garmin battery, and likewise the negative to the negative (reversed polarity so the greater voltage from the 9V battery forced the current backward thru the garmin battery). Left it over night and resulted in about 5.5 V in the garmin battery after disconnecting. Put it back in the 296 and it charged back up from external power.
I have been ultra inspired by this fantastic video! I have however tried my own experiments. How this all started with a message on my Garmin GPSMAP 296 that said 'Battery Missing". LATEST UPDATE: 21/06/22 - After YEARS of not being charged, this method WORKED. After 7 hours of being on charge in the unit, I have tested the battery, and it is maintaining voltage! Hi All, I have the same problem with my Garmin GPSMAP 296. What I did was get a 12 volt battery, and I took the 296 battery out. With the Garmin logo on the back of the battery looking at you, and the 3 copper points on the back of the battery, the one on the very left is the negative, and the one on the very right is the positive. I connected a 12v battery to the positive (right) and negative (left) terminals for 6 minutes (I haven't tested the centre terminal to see what that is). Prior to connecting the battery, I had 0.586 volts on the Garmin battery. After connecting (with a couple of wires and sticky tape) to the terminals, I set a timer for 6 minutes. After the 6 minutes, I had a voltage of 2.658 volts. I put the battery in to the Garmin 296 after that, and it didn't say 'Battery Missing' like it has for ages, but now says charging. I've got the 296 connected to a 12v source, as if it was in the aircraft, and the battery installed in the 296, so is set as a standard setup I didn't need to take the battery apart or make any modifications. I've only just done this, and am hesitant to take the battery out whilst it says charging (love to give you a progress update to see if this method is successful - fingers crossed), but I'll wait until the morning give you an update after taking readings and post them here. It's either gong to be successful or not. This has been posted on the 20th of June 2022 from Eastern Australia at 7:32pm (UTC +10), so I'll update you with the results tomorrow. NOTE: I didn't use a 9v battery as recommended in the video. I decided to spike with a 12v to hopefully excite the circuit, but for a short period of time. So far, so good using this method. I should note however, that my battery pack is well over 10 years old, so I wouldn't expect it to last that long, but I'll see what happens after my experiment! I did order a new after market battery today, only because I know a 10+ year old battery should be replaced after that time, and I like to have a backup system (and don't rely purely on one source of power in the plane). Please be careful if you decide to do the same thing. Go with a reputable dealer as there are many shonky batteries on the market. You spent a lot on the 296. Don't wreck it with a cheap and crappy battery. Update for everyone - And I know this is a very niche site - Really, how many people fly planes and have a 296! Anyway, it is now 9:21pm on the 20th of June 2022 - And after 3 hours, the Garmin GPSMAP 296 still says 'Charging'. As I said, I'm not taking it off for fear it may be working and I don't want to ruin the process, even though I am so tempted to test the voltage! More info tomorrow after at least a 6 hour stint (which will probably be 8 hours) but after that time, I will send through the results of this experiment anyway. Okay - I have bought another battery anyway, so after 3 hours, I have decided to check what is going on. What have I done? Will it work or not? Okay, 9:33pm after 3 hours of charging: Wow - 5.31 volts! Maybe it is working! I pulled the battery out and had a message 'Battery Missing' after doing this. Put the battery back in and had a message 'Battery Missing' for about 20 seconds, but then, ' Charging'. So far, this is working! More updates in the morning! (9:34pm) - Feeling Optimistic! Please also note that the battery indicator on the 296 shows fully charged by the picture (no numerical figures or percentages) so obviously this these are incorrect statistics at my stages of this experiment.
Hi, thanks for all your input, I have a 276c I need to charge. Do you have a picture or a sketch of the terminals on the battery, ? Do I have to use all 3? Or just the 2 outside terminals?
My thanks for the excellent manual as shown in the video is great. I have followed this manual and thus got the battery of my Garmin 278C (message "missing battery") back to the point where it is now charging in the device again.
It WORKS ! Followed your video because my Garmin GPSMAP 396 battery went Flat on me because I didn't use it for over 1 1/2 years. Now I am just waiting for the glue to dry. Thanks for the help.
You can't imagine how much energy you saved by this video. Thank you, piece of good job. In my Garmin out of battery pack were red and black wires so no need to cut anything.
I found an even simpler way, take the rechargeable battery out of the unit, take a 9 volt battery, place the battery right on the contacts of the garmin battery , the negative post of the 9 volt battery on the left contact of the garmin battery, the positive post on the middle contact, I clumbled some tinfoil between the contacts and let it sit for 2 hours and Voila , charging normally and no more message 'battery missing'
Super!!! me salvaste de cambiar la batería. Las baterías mías median igual que las tuyas, debajo de 1 V, y con este artilugio las volví a la vida. MUCHAS GRACIAS!!!
I cut all the way around the box and so I could pry up the back cover a little but could not go any farther. There is double stick tape on the battery to stick it to the case. I took my hot air gun at the low setting and heated the back of the case for awhile. The case got warm and the tape got soft enough to put the battery out.
I did the same with AERA 795 Battery. After easy opening (cut along the lines on 4 sides of the battery) you will find 4 batteries. Dont cut plastic wrap as there are 4 separate batteries coneccted 2+2 paralelly. terminals are covered with white stripes of paper between 1,2 and 3,4 batteries. Check polarization and connect +/+ -/- (v battery. As only battery raise the voltage to 6,6 V disconnect and put into GPS for fulll charge (regardles of cutted off top everything stays in one piece inside). after that you can glue the cutted piece back or use as it is. When in GPS battery will not drop out.
Although there is a Protection Circuit Module attached to the battery acting as Thermal Interrupt etc, it appears that the GPS Map 496 has an on-board smart charger that will not charge the battery if the voltage is too low. After months of disuse my 496 showed "Battery Missing" and would not charge. A multi-meter showed 0,18 volts. Noting the polarity, i connected a 9 V alkaline battery to the two outer connectors of the 496 battery using wires and left it about 2 hours. The 496 battery then showed 5.9 V. On putting it back in the GPS Map 496 it showed charging and I left it several hours on charge. You do not need to dissect the battery, at least not with the GPS Map 496.
on my 496 it did only work after i opened the battery. also it gave some smoke puff on connecting the 9V battery with correct polarity. However, the rest of the process worked. I don t know if the smell was arching or it blew the circuit of the control board, though it is still charging correctly. I also don t know where the loose black wire, which i also had and soldered (after finishing the 9V revive) to the free spot on the housing is for
Thanks for the great tutorial. My case was a little harder to get into as there was 2-sided sticky tape holding the batteries to the case and cover. Couldn't find your charger on ebay.uk, but did find one in the US. Thanks.
@@SuperRealityKid Battery looked like it was a gonner, but after following your instructions and cycling the batteryseveral times, I am now getting about 6 hours of operation on a single charge.
Great tutorial but there is a much easier way to do it, and without opening the battery. Place the battery in front of you so you can read the garmin logo properly. Connect (-) terminal of the charger to the FIRST terminal and (+) to the SECOND terminal of the battery. Charge for 8 hours at about 200mA and then put the battery back into the GPS, let it charge the remaining. Done! The only challenge is to attach the cables, you need something to put conatant pressure, like a clamp or something.
This can be much easier accomplished without taking the battery apart, simply take the Garmin battery out of the unit and place a 9-volt battery on the left 2 contacts with the negative post of the 9-volt battery on the left (negative) contact of the Garmin battery and the positive post of the 9-volt battery on the center (positive) contact of the Garmin battery, let it sit (charge the Garmin battery) for 2 hours and replace the Garmin battery in the unit and charge until it is fully charged. I crumbled some small pieces of tin foil and place them between the contacts of the Garmin battery and the posts of the nine-volt battery to establish good contact.
This much easier method of not taking the battery apart by attaching the charger wires with masking tape worked for me with my completely dead 495 battery, yay!
Well there's no way this side of salvation that I would have the dexterity/competence/interest to do the above but I nevertheless found it informative and interesting to watch!
thank you , it worked with garmin 276c batteries , but when i try to charge the battery in the device , its keep changing from charging to charge complete and only charge to the half
Hi, thanks for all your input, I have a 276c I need to charge. Do you have a picture or a sketch of the terminals on the battery, ? Do I have to use all 3? Or just the 2 outside terminals?
I opened the case as you showed and found the black wire hanging loose also as you did. I assumed that I had cut it or pulled it off the circuit board while prying the back off. There is a terminal with a bit of wire on it adjacent to that location. You didn't mention whether you re-soldered it to the terminal on the circuit board or left it hanging loose? Thanks for a reply.
Hi guys! Please tell me how you can restore a broken antenna wire (external) GPS antenna GA 26 BNC, I do not understand how to destroy this plug from the antenna to the gps itself. Surely someone has already encountered such a problem.
Thanks for your excellent tutorial, I have searched Ebay UK for your site to buy the charger - only found a source in the USA. Do you still sell them? If so how to I buy same?
Hello David. Sorry, no, I bought a batch from the American maker, a small independent, might be worth a Google. I'll try to find his details but it was 5 years ago. Cheers, Jim.
It's too late now, but if you're going to epoxy it back together, it might be wise to make holes in the case so you can access those terminals in case you ever have to do this again.
Hi, Thanks for your reply I’m in France. Would you consider posting? Found that one battery is dead flat (i.e. 0V). It looks to me it's just solded!? no risk to harm it with heating if I sold it? Have you ever replaced one? I see replacement can be found on the web unless you can supply some too..?.. thanks Philippe
the Garmin battery may be one of several types, mine is a 011-00955-02 (2300 mAh), and i had to disassemble it to revive it . It contains 2x 18650 with soldering vanes and a control circuit board
I wanted to add my thanks to the already existing chorus. It appears I have successfully revived my Garmin GPSmap 396 as it now indicates that the battery is charging rather than the dreaded "Battery Missing" message. Reading all of the comments led me to try revival without disassembly. I wired a 9volt battery to the correct terminals on the back of the Garmin battery using a couple of small finishing nails, two clamps to hold them in place and an alligator clip to connect to the positive terminal on the 9volt. Left it "charging" overnight. Many thanks!! 🪂🛩🚁
I tried this with a deeply discharged 496 battery. I was able to do it without opening the case. The initial battery reading before charging was between .5 V and .6V on the two positive terminals. I made two wire loops from safety wire and attached the loops to alligator clips and then duct taped them to the left hand terminal (-) and the far right hand terminal (+) the other end of the alligator clips were attached to a new 9 volt battery. I took approximately 6 hours to get the battery to a charge level of 5.4 volts. After that I charged it in the 496 overnight and it was now fully charged. I plan to discharge it to the 50% level and then recharge again. We shall see how it holds up. Thank very much for the video and inspiration to do this.
Do you have a picture of the battery so I can see what ones are the 2 + ans one - pins are ,??
David, Thanks for your recommendation. I tried your method last night on a battery that had sat for 7 years and it worked perfectly. Like a jump start.
I have recovered my two 276C batteries that could not be fully charged using the reverse polarity method as below - thanks for this tip.
I have recovered the battery without opening it up, as others have commented here. I used the outer terminals, identified the positive and negative with a multimeter - for me, with the battery oriented with the printing rightside up, the left was the negative and the right one the positive. I had about 1V in the garmin battery. With wire I connected the positive terminal of a 9V battery to the positive of the Garmin battery, and likewise the negative to the negative (reversed polarity so the greater voltage from the 9V battery forced the current backward thru the garmin battery). Left it over night and resulted in about 5.5 V in the garmin battery after disconnecting. Put it back in the 296 and it charged back up from external power.
I have been ultra inspired by this fantastic video!
I have however tried my own experiments.
How this all started with a message on my Garmin GPSMAP 296 that said 'Battery Missing".
LATEST UPDATE: 21/06/22 - After YEARS of not being charged, this method WORKED. After 7 hours of being on charge in the unit, I have tested the battery, and it is maintaining voltage!
Hi All, I have the same problem with my Garmin GPSMAP 296. What I did was get a 12 volt battery, and I took the 296 battery out. With the Garmin logo on the back of the battery looking at you, and the 3 copper points on the back of the battery, the one on the very left is the negative, and the one on the very right is the positive.
I connected a 12v battery to the positive (right) and negative (left) terminals for 6 minutes (I haven't tested the centre terminal to see what that is). Prior to connecting the battery, I had 0.586 volts on the Garmin battery. After connecting (with a couple of wires and sticky tape) to the terminals, I set a timer for 6 minutes. After the 6 minutes, I had a voltage of 2.658 volts. I put the battery in to the Garmin 296 after that, and it didn't say 'Battery Missing' like it has for ages, but now says charging. I've got the 296 connected to a 12v source, as if it was in the aircraft, and the battery installed in the 296, so is set as a standard setup
I didn't need to take the battery apart or make any modifications. I've only just done this, and am hesitant to take the battery out whilst it says charging (love to give you a progress update to see if this method is successful - fingers crossed), but I'll wait until the morning give you an update after taking readings and post them here. It's either gong to be successful or not. This has been posted on the 20th of June 2022 from Eastern Australia at 7:32pm (UTC +10), so I'll update you with the results tomorrow. NOTE: I didn't use a 9v battery as recommended in the video. I decided to spike with a 12v to hopefully excite the circuit, but for a short period of time. So far, so good using this method. I should note however, that my battery pack is well over 10 years old, so I wouldn't expect it to last that long, but I'll see what happens after my experiment! I did order a new after market battery today, only because I know a 10+ year old battery should be replaced after that time, and I like to have a backup system (and don't rely purely on one source of power in the plane).
Please be careful if you decide to do the same thing. Go with a reputable dealer as there are many shonky batteries on the market. You spent a lot on the 296. Don't wreck it with a cheap and crappy battery.
Update for everyone - And I know this is a very niche site - Really, how many people fly planes and have a 296! Anyway, it is now 9:21pm on the 20th of June 2022 - And after 3 hours, the Garmin GPSMAP 296 still says 'Charging'. As I said, I'm not taking it off for fear it may be working and I don't want to ruin the process, even though I am so tempted to test the voltage!
More info tomorrow after at least a 6 hour stint (which will probably be 8 hours) but after that time, I will send through the results of this experiment anyway.
Okay - I have bought another battery anyway, so after 3 hours, I have decided to check what is going on. What have I done? Will it work or not? Okay, 9:33pm after 3 hours of charging: Wow - 5.31 volts! Maybe it is working!
I pulled the battery out and had a message 'Battery Missing' after doing this.
Put the battery back in and had a message 'Battery Missing' for about 20 seconds, but then, ' Charging'. So far, this is working!
More updates in the morning! (9:34pm) - Feeling Optimistic! Please also note that the battery indicator on the 296 shows fully charged by the picture (no numerical figures or percentages) so obviously this these are incorrect statistics at my stages of this experiment.
Hi, thanks for all your input, I have a 276c I need to charge. Do you have a picture or a sketch of the terminals on the battery, ? Do I have to use all 3? Or just the 2 outside terminals?
Awsome tutorial! I almost lost hope to revive my 296's battery again. Thank's to you, it's now charging like new.
Just finished the recharge. The battery has a full charge. Thank you for a great video. Very happy with the results.
My thanks for the excellent manual as shown in the video is great. I have followed this manual and thus got the battery of my Garmin 278C (message "missing battery") back to the point where it is now charging in the device again.
It WORKS ! Followed your video because my Garmin GPSMAP 396 battery went Flat on me because I didn't use it for over 1 1/2 years. Now I am just waiting for the glue to dry. Thanks for the help.
you are THE MAN, perfect guide, perfect explanation, easiest fix of my life, thank you very much, DONE ON MY 378 GPSMap ADV Plotter
Doing this to my Garmin 496 battery as we speak. Thank you for doing this video!
Cheers,
Les
... FANTASTIC .... managed to revitalise my 2 batteries (new in 2008) but havn't been fully recharged since 2015 ... Thanks...
You can't imagine how much energy you saved by this video. Thank you, piece of good job. In my Garmin out of battery pack were red and black wires so no need to cut anything.
I found an even simpler way, take the rechargeable battery out of the unit, take a 9 volt battery,
place the battery right on the contacts of the garmin battery , the negative post of the 9 volt
battery on the left contact of the garmin battery, the positive post on the middle contact, I clumbled
some tinfoil between the contacts and let it sit for 2 hours and Voila , charging normally and no
more message 'battery missing'
Worked like a charm ! thank you
Gran tutorial. He recuperado mi batería sin problemas.
Super!!! me salvaste de cambiar la batería. Las baterías mías median igual que las tuyas, debajo de 1 V, y con este artilugio las volví a la vida. MUCHAS GRACIAS!!!
IT WORKS.........THANKS YOU SO MUCH!!!!!! AWESOME VID!!!
I cut all the way around the box and so I could pry up the back cover a little but could not go any farther. There is double stick tape on the battery to stick it to the case. I took my hot air gun at the low setting and heated the back of the case for awhile. The case got warm and the tape got soft enough to put the battery out.
Worked like a charm thank-you.
I did the same with AERA 795 Battery. After easy opening (cut along the lines on 4 sides of the battery) you will find 4 batteries. Dont cut plastic wrap as there are 4 separate batteries coneccted 2+2 paralelly. terminals are covered with white stripes of paper between 1,2 and 3,4 batteries. Check polarization and connect +/+ -/- (v battery. As only battery raise the voltage to 6,6 V disconnect and put into GPS for fulll charge (regardles of cutted off top everything stays in one piece inside). after that you can glue the cutted piece back or use as it is. When in GPS battery will not drop out.
Although there is a Protection Circuit Module attached to the battery acting as Thermal Interrupt etc, it appears that the GPS Map 496 has an on-board smart charger that will not charge the battery if the voltage is too low. After months of disuse my 496 showed "Battery Missing" and would not charge. A multi-meter showed 0,18 volts. Noting the polarity, i connected a 9 V alkaline battery to the two outer connectors of the 496 battery using wires and left it about 2 hours. The 496 battery then showed 5.9 V. On putting it back in the GPS Map 496 it showed charging and I left it several hours on charge. You do not need to dissect the battery, at least not with the GPS Map 496.
on my 496 it did only work after i opened the battery. also it gave some smoke puff on connecting the 9V battery with correct polarity. However, the rest of the process worked. I don t know if the smell was arching or it blew the circuit of the control board, though it is still charging correctly. I also don t know where the loose black wire, which i also had and soldered (after finishing the 9V revive) to the free spot on the housing is for
I have a 496 so I'll keep that in mind.
THANKS OS MUCH!!! Got it Fixed!!! :)
Thanks for the great tutorial. My case was a little harder to get into as there was 2-sided sticky tape holding the batteries to the case and cover. Couldn't find your charger on ebay.uk, but did find one in the US. Thanks.
Hi, thanks. Yes, I sold out of those chargers. :-)
@@SuperRealityKid Unfortunately, the battery will not hold a full charge anymore. Worked flawlessly for 10 years, so I suppose I got my money's worth
@@SuperRealityKid Battery looked like it was a gonner, but after following your instructions and cycling the batteryseveral times, I am now getting about 6 hours of operation on a single charge.
Hello
thank you very much for the guide
I solved without money :-) :-) :-)
Great tutorial but there is a much easier way to do it, and without opening the battery. Place the battery in front of you so you can read the garmin logo properly. Connect (-) terminal of the charger to the FIRST terminal and (+) to the SECOND terminal of the battery. Charge for 8 hours at about 200mA and then put the battery back into the GPS, let it charge the remaining. Done! The only challenge is to attach the cables, you need something to put conatant pressure, like a clamp or something.
This can be much easier accomplished without taking the battery apart, simply take the Garmin battery out of the unit and place a 9-volt battery on the left 2 contacts with the negative post of the 9-volt battery on the left (negative) contact of the Garmin battery and the positive post of the 9-volt battery on the center (positive) contact of the Garmin battery, let it sit (charge the Garmin battery) for 2 hours and replace the Garmin battery in the unit and charge until it is fully charged.
I crumbled some small pieces of tin foil and place them between the contacts of the Garmin battery
and the posts of the nine-volt battery to establish good contact.
This much easier method of not taking the battery apart by attaching the charger wires with masking tape worked for me with my completely dead 495 battery, yay!
@@mandolinviolin Hi Peter where is the positive on the garmin battery on the middle or in the far right? For sure the negatif is on the far left!
@@ALF-PILOT I can't remember , try it either way, you won't damage it, I think it is the far right.
@@peterleyenaar8870 ok thanks you
Thanks for this video. For about $10 the batteries can be replaced with new ones. I doubt the capacity of the old batteries is very good.
@@SuperRealityKid Guess he meant to replace the cells themselves, sort of mending the battery back with new fresh cells
Well there's no way this side of salvation that I would have the dexterity/competence/interest to do the above but I nevertheless found it informative and interesting to watch!
thank you , it worked with garmin 276c batteries , but when i try to charge the battery in the device , its keep changing from charging to charge complete and only charge to the half
Hi, thanks for all your input, I have a 276c I need to charge. Do you have a picture or a sketch of the terminals on the battery, ? Do I have to use all 3? Or just the 2 outside terminals?
I opened the case as you showed and found the black wire hanging loose also as you did. I assumed that I had cut it or pulled it off the circuit board while prying the back off. There is a terminal with a bit of wire on it adjacent to that location. You didn't mention whether you re-soldered it to the terminal on the circuit board or left it hanging loose? Thanks for a reply.
Hi guys! Please tell me how you can restore a broken antenna wire (external) GPS antenna GA 26 BNC, I do not understand how to destroy this plug from the antenna to the gps itself. Surely someone has already encountered such a problem.
Thanks for your excellent tutorial, I have searched Ebay UK for your site to buy the charger - only found a source in the USA. Do you still sell them? If so how to I buy same?
Have you sold the charger yet. If not I would like to purchase it. Regards Richard
Hi can you please tell me do you still have the independent battery chargers available, I cant find them on Ebay ?
Hello David. Sorry, no, I bought a batch from the American maker, a small independent, might be worth a Google. I'll try to find his details but it was 5 years ago. Cheers, Jim.
Search garmin 496 battery charger on eBay....,.It is there, I am the manufacturer of the stand alone unit.
It's too late now, but if you're going to epoxy it back together, it might be wise to make holes in the case so you can access those terminals in case you ever have to do this again.
"The power of accurate observation is commonly called cynicism by those who have not got it." - George Bernard Shaw
Hello. What is the model of the battery charger? Thank you
Do you still have the Garmin chargers anymore?
Forgot to thank to the autor for inspiration ;-)
The question is what is the lose black wire?
does it work with pp3 alkaline battery?
That's what I used. :-)
Do you sell the charger?
Hi,
Thanks for your reply
I’m in France. Would you consider posting?
Found that one battery is dead flat (i.e. 0V).
It looks to me it's just solded!?
no risk to harm it with heating if I sold it?
Have you ever replaced one?
I see replacement can be found on the web unless you can supply some too..?..
thanks
Philippe
Excelent. But I have no Bat status indication on display: Bat status - 00:00. Everybody knows what does it mean?
Do you still sell the chargers?
I manufacture/sell the chargers skywagon@gmail.com
Hi
Can you give me the battery number
the Garmin battery may be one of several types, mine is a 011-00955-02 (2300 mAh), and i had to disassemble it to revive it . It contains 2x 18650 with soldering vanes and a control circuit board
for $20 I will buy a new battery.. not worth short circuiting the device in flight and having in cabin fire
I wanted to add my thanks to the already existing chorus. It appears I have successfully revived my Garmin GPSmap 396 as it now indicates that the battery is charging rather than the dreaded "Battery Missing" message.
Reading all of the comments led me to try revival without disassembly. I wired a 9volt battery to the correct terminals on the back of the Garmin battery using a couple of small finishing nails, two clamps to hold them in place and an alligator clip to connect to the positive terminal on the 9volt. Left it "charging" overnight. Many thanks!! 🪂🛩🚁