Watts Inside? - Greenworks 40v4ah Lithium battery pack opening
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- čas přidán 7. 09. 2024
- It was a bad idea for this company to make their old batteries not compatible with the new line they have released. Either way it seems alot of tool suppliers are selling these off and they can be found for a reasonable price. Not many have opened these packs yet so i wasn't sure what to expect! After a little digging, i found 20x 18650 cells in a 10s2p configuration. I have yet to do a discharge test(fingers crossed), so stay tuned for more...
Cool! Very interesting to see inside one of those battery packs.
Thanks for sharing!
-Duane
I found to activate the battery need a 4.7k resistor from positive to one or other pins in the middle, it gently turn on by activating internal MOSFET with a pwm noise heard into my 200watts 120vac incandescent bulb, I use this bulb to see if it turn on. I am still looking for information about the pins 2&3, one is C and other have a ohms symbol on it, maybe C is for common but I will investigate more.
Thanks Duane! was a fun project and its a safe handy back-up pack for when my frame battery dies.
These are lawn care tool packs, But the dell batteries were bought from an old website legend-micro,com they may still be around but remember the low C rating of laptop cells when building packs!
Thanks for watching!
Got myself the greenworks electric wheelbarow. Tested conecting ryobi 18v in series 39,5v out. Sadly it only works for 4 seconds before turning off. It got 3 connections + - and the one right next to -. I belived it is the com pin. But hearing you say the diffrent voltage it got me intrigued. I am trying to find socumments on the diffrent pin outs to get better answers but i migt need to accept defeat and by a solo greenworks battery
would really like to know which 20v and 40v and 80v batteries can be used with which tools from other brands even with a little modification. this would be really helpful to everyone
I'll have to look into that, I've been commuting 25 miles a day with 2c Sony cells in a 6p formation. It's possible with enough cells in parallel of course.
Scott
Looks like a well built battery. I'm impressed by Greenworks.
Yes it was a lot easier!
thanks for watching
Hey nice video They don’t want you to go to batteries plus for repairs or add new batteries.
really a good vid, thanks for posting - your camera was moving to much - try putting it on a trip-pod to keep it steady. really a good vid. thanks again
IMR'S are great batteries..They have protection built in to the cells they should be a tad bit longer than the sony cells.
Does anyone know what these other 2 slots are? Next to + and -
Say you had this mower and the battery died. Do you think you could easily rebuild the pack with new cells? Those looked like some beefy tabs welded on there.
cool video thanks
I purchased one of these 40v batteries and the power indicator strip on the outside has never worked. Any Suggestions?
On my 40v 2 ah I only get 35V at the terminal , fully charge there should be 41V.
Not ideal to use them directly with some kind of ebike , already down 18% at start , .
You should solder wires directly to the cell tabs if you want to discharge the pack on an Ebike
They have 4 connectors on the batterry, 1 is positive and 1 nagative whats the other 2 connector for ? Pls tell me how many volt the third connector supply ? Thanks
At least one terminal is used for communication with the BMS circuit inside the pack. It allows you to turn the battery on and off.
no memory effect batteries are usually low discharge rate, which are not powerful enough to run a bike
If my battery won’t charge and the red light is blinking… has the battery gone to a too low voltage?
If I don’t have another 40v battery how can I jump start it?
Yes you may have a weak or dead cell group in the battery. You may need to open it up and check each cell group with a voltage meter. You could replace the bad cells or try to charge them with a single cell charger and bring some life to them
What it's discharge rate (C) ?
Recencly I purchased greenworks lawn trimmer without battery pack. When I connect 37V(10A) DC power to the trimmer, it works only a few seconds and it stops with beep sound. I guess one terminal near minus input performs unlocking. Inside the trimmer, only three terminals are used among four termals from battery pack . Can anyone help me ?
I think you, and I are on the same mission. From my understanding that the battery is sending information to the controller of the devices for a status update. I am trying to replicate a signal to the controller, but running into the issue of not having a battery to understand what a good signal is suppose to look like. Has anyone else tried to replicate this signal?
I have a similar project in mind. Could one not just bypass the controller to send DC power to the motor and use a regular on/off switch? I believe this model uses a brushed motor so the motor should run just fine with the 37DC power directly connected, no?
I have same problem as you guys have, but I know one thing , there are 3 connector 1 nagative black wire, 1 possitive red wire but there is a smaller white wire call Com, it connect to the third connector from batterry , but I dont know how many volt it supply ? Some have death original greenworks battery can open it to see how it works.
Did any of yall ever find a solution?
I have the same issue, does anyone solved it?
late to this game. I have 4 of these packs. they are getting hard to find. Is it possible to just buy the g-max and do a straight cell transplant (including circuit board) to the old greenworks casing.
Are these batteries lithium ion, or lithium iron phosphate? I guess LFP is 3.2V/cell and Li is 3.7V/cell.
The cell is lithiun ion with 3.7V per cell. Packing configuration is 10s2p.
you got too much additional unnecessary knowledge
They are 18650 cells with a nominal voltage of 3.7 volts/cell. 4.2volts/cell when fully charged. LiFePO4 cells would be cool, but unfortunately not.
Interesting info but the camera shakes too much...secure cam when possible; move and rotate item instead.
So what did you do with this? Would this ne able to be reconfigured in 12v or does the tabs make it impossible to do?
anyway we can use these packs without having to tear them apart, to use them for a E bike?
these are only worth it if u can find them around 50$ each otherwise build an 18650 pack from scratch... ya its possible but why would you?
skeetab5780 i've got zero education in electrics and wiring, was wondering if you knew any good ready made battery packs for a e-bike for a motor that goes past 40mph+ ... any ideas?
i have a brand new 4.0 ah, 40v gmax battery that has two issues, 1. the battery voltage indicator doesnt work at all 2. when I put it on the charger it goes right to a green light? greenworks is sending me a brand new replacement, I can keep the faulty one. question is , do you know how I can repair it? I would love to have aback up battery, im sure its in the circuitry or associated. I can solder, use a meter, etc
your board inside is gone dead. Salvage batteries and using BMS board from ebay, make a power source of your choice.
Hi can you measure the 3rd pin of the battery, please? One is +40 and the otherone? Is the 3rd one a databus?. I made a battery by my self but my highpressure washer GDC40 is turning after 5s off. Thank you.
Exactly the same thing with me. I'm trying to get a GDC40 pressure washer to work with a bicycle battery. Works for 5 seconds, then shuts off.
He did say at the beginning of the video that you can't find 36 volts in + and minus.. I don't believe this. I'll explain it like this. I have disassembled the washer, and there is a thin wire coming from the third pin.
But if you look at other li-ion (like drilling machines) batteries, there is ~5-8 kilo Ohm resistance against the minus pole.
Because of this, I have been try to find the right ohm value with the trimmer potentiometer, but I couldn't find it!! I adjusted all values between 0 and 12 kilo Ohms. There are no correct values in between those values. Too bad!
How did you solve it yourself?
so how did this battery work out for ya....your skills are much greater than mine
Open battery, replace fuse, fixed.
Im wondering if the mower is actually running on 20v from the tabs instead of 40
I have the GW 300W inverter. inside the contacts one of the terminal connections is bridged to the positive terminal. This creates the series connection to make it 36v (or the 40v suggestion by GW)
I think those are 5 blocks of 4 cells in series, where each of one has 2 battery in series and 2 in parallel. So 4.2*2=8.4v*5 blocks =42v
Please stop moving the camera from side to side. Instead tie the camera to the back of a poodle to provide a steadier picture
To use the 40v battery outside the tool, it needs to enabled. Do you know how
this is done (C & Ω terminals)?
I turn it on with a 4.7k resistor between positive and 2 or 3 pins number, it work but need to investigate.
Google" Lipo balance wiring guide" and the first link that comes up is a very helpful website to help you get familiar with how balance wires attach. Because I use a 6s balance charger I may end up using 2x 5s balance leads.
Can somone post link to these cells?
What's the discharge current on these in amps.
I've got 3 of these batteries from craigslist and want to try rigging to power an electric bike. Batteries all showing full charge, but only to 35V and they are 40V batteries. However, multimeter shows the charger is only outputting 35V? Is it possible I've got a faulty charger?
As the pack consists of 10S1P, the pack must show near 42V if you check the voltage right after completion of charge.
I guess there is a trouble in your charger.
Thank you - since the batteries are nearly new, we figure this is the case - going to try them with a different charger and see.
Also thinking about doing the same. What do you plan todo with the connectors? Open the wackand wire it or create a 4 pin connectors?
Hi Pierre-Luc. My plan is to crack the case and solder new wires. What I need to know is which two of the four connectors on the batteries are for charging. Note also I didn't find it easy to snap off the tampering pins on the Torx, so I went and bought a special pinned T10.
psburinkou good. I plan to hack a connector since I need my packs intact for my lawn mower.
Can this Cell package be used for an E-Bike power pack now that you showed us how to get 40 volts out of it ?
+Richard Prince Yes I use 4x of them in a 20s 8ah setup they work good up to about 25-30amps
Did you find a way to get output from the battery pack terminals without diassebling the pack ?
Can i use these cells in an 18V battery?
Yes 18v and 20v tool packs typically use a 5 cell in series 18650 format
funny how many people watched this video !
what type of battery cells it contains?
They are a generic no name cell from what i can remember, the blue shrink wrap is a dead givaway
What are the balancing tabs you are using? Where did you get them? Thanks
They are 5s JST extensions from hobbyking.com
Thanks for watching!
@@Cheeseburger4362 the easiest way to tap into the 36v of the pack is to open the hosing and solder the output leads directly to the cell tabs bypassing the bms board, you can leave the bms intact so you can still charge it regularly also. Otherwise you can buy a cheap greenworks power tool and remove the battery mount wiring harness and attach it to that too
hard to watch this video with all of the shaking and movement.
Wow, others just use 10 cells for fourty volts...
That's because they only have one series string - instead of two.
haha cheesy title.