Just something to be aware of with a LiFePO4 battery as they have an extremely flat charge curve that using an active balancer while it is in the flat section of the curve will do more halm to the balance of your battery than just not having the balancer. Andy at the Off-Grid Garage posted a video about this within the last few days. The recomendation is to turn the balancer off when it is in the flat area of the voltage curve and turn it back on again as it gets higher (I think 3.45v per cell).
Andy also learned me to charge well below 3.65 Volts and that the cells will charge up to as good as 100%. A good thing we have people sharing this kind of information on the internet!
Awesome, I just made my first battery pack and managed to short it out burning a bit of wire in the process it seems no harm done except my nervous system has lost a few years I hate those bloody 'vape' things that litter my country side so I started to collect them and keep the cells and I just built a 2S pack ! (don't laugh) with a small BMS and now I have 8.4v (3.7 nominal) at my disposal but my main motivation was I wanted a DC +/- 3.5v supply (+3.5v 0v -3.5v) so job done. Lesson learnt is dont build this stuff with fully charged cells !!!.....cheers.
Yes ! In the pursuit of the perfect sinewave for audio work have have built a lot of Bulb Stabilised Wien Bridge Oscillators I have gone from breadboard through Vero board and now have PCBs. So last bit of the puzzle a low voltage clean DC supply for the opamp ! and a few vapes of the roads...cheers. @@JulianIlett
those 46160 you had seem easier to work with . time will show the cycles and average capacity.. right now i compeletely disasembled my 8s and i m gonna run individual capacity tests because i dont like daly and how it worked..!!! . i m thinking of 8 voltmeters too but no led like spare ones i have!!!! nice battery but that was a lot of effort and time and its going to eat you even more !!! hope it has good results and make you try even more types of LFPs
Great stuff Julian, you take a properly educated approach to the electrical matters, such a refreshing change. These self taught amateurs are meddling with potentially dangerous (not so much shock, but fire/explosion) lithium cells and encouraging other tech naive hobbyists to do the same - I take HnS seriously. BTW what are those tasty looking little lcd volt meters at the back monitoring cell volts. Noramal ones wont work down at that low volts? any link pls
Just something to be aware of with a LiFePO4 battery as they have an extremely flat charge curve that using an active balancer while it is in the flat section of the curve will do more halm to the balance of your battery than just not having the balancer. Andy at the Off-Grid Garage posted a video about this within the last few days. The recomendation is to turn the balancer off when it is in the flat area of the voltage curve and turn it back on again as it gets higher (I think 3.45v per cell).
Andy also learned me to charge well below 3.65 Volts and that the cells will charge up to as good as 100%. A good thing we have people sharing this kind of information on the internet!
I've found the balancer just does nothing in the flat middle area - it doesn't unbalance the cells.
@@JulianIlett sorry to hijack like this, have you ever used an electrolite flow system?
Great to see you again!
You too!
Awesome, I just made my first battery pack and managed to short it out burning a bit of wire in the process it seems no harm done except my nervous system has lost a few years I hate those bloody 'vape' things that litter my country side so I started to collect them and keep the cells and I just built a 2S pack ! (don't laugh) with a small BMS and now I have 8.4v (3.7 nominal) at my disposal but my main motivation was I wanted a DC +/- 3.5v supply (+3.5v 0v -3.5v) so job done. Lesson learnt is dont build this stuff with fully charged cells !!!.....cheers.
That's really cool. What's the split power supply for? Some sort of audio circuit?
Yes ! In the pursuit of the perfect sinewave for audio work have have built a lot of Bulb Stabilised Wien Bridge Oscillators I have gone from breadboard through Vero board and now have PCBs. So last bit of the puzzle a low voltage clean DC supply for the opamp ! and a few vapes of the roads...cheers. @@JulianIlett
Nice, how good is the shed fire extinguisher 🙂
Ha ha. It's still got pressure I think :)
those 46160 you had seem easier to work with . time will show the cycles and average capacity.. right now i compeletely disasembled my 8s and i m gonna run individual capacity tests because i dont like daly and how it worked..!!! . i m thinking of 8 voltmeters too but no led like spare ones i have!!!! nice battery but that was a lot of effort and time and its going to eat you even more !!! hope it has good results and make you try even more types of LFPs
Great stuff Julian, you take a properly educated approach to the electrical matters, such a refreshing change. These self taught amateurs are meddling with potentially dangerous (not so much shock, but fire/explosion) lithium cells and encouraging other tech naive hobbyists to do the same - I take HnS seriously. BTW what are those tasty looking little lcd volt meters at the back monitoring cell volts. Noramal ones wont work down at that low volts? any link pls
Thank you - much appreciated. The LCD voltmeters are cut down BT168D battery testers.
Some of the subunits of the batters seem to have different numbers of cells. Did i observe correctly?
Shame you did not get the caps exploding on camera🙂
Squeak !!!!!!!
@@andymouse Cheese!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
what balancer is that thing?
www.aliexpress.com/item/1005005241453498.html
A man of your calibre should know to not have the cable plugged in whilst wiring the bare ends. :)
I've done it before too - I'll never learn.