sorry if this is old ground and been covered before but I cant quite find the answer Imlooking for.
Ive now got around 1000 cells that I have recovered from old leptop battery packs. I now have them all tested and re charged and have also got them all set aside in boxes grouped from 1500 ma to
2850 ma. Ofc I dont have many at or close to the 2850 range.
I boxed them like this 1500 to 1650 then 1650 to 1750. 1750 to 1850 and so on right up to 2750 to 2850 and higher.
My question is on grouping the cells to make my 14s battery. I have seen that some of you dont use cells that are more than 200 ma between the highest and lowestcapacity. Unfortunately I dont have enough cells that are with in this range to build a battery large enough to be worth while so Im asking what you guys think would be the down side of using cells with a larger difference would be or is it simply a very bad idea. ????
Of course I would build each pack so that all 14 packs had the same total capacity as each other and the same number of cells in each pack as well.
If for example I had the highest cell in a pack at say 2800 ma and the lowest cell at 2200 ma capacity would it work like this during charging and discharging. As apack started to discharge the lower capacity cell would start to loose voltage faster than the highest one so the highest one would give out more to compensate so that when the pack was flat each cell would still be at the same voltage as all the others in the pack. And during charging the opposite would apply the larger capacity cells would absorbe more charge than the low capacity ones.
If Im corect then it shouldnt matter if a pack has different capacity cells providing the total capacity of each pack with in the 14s battery have the same total capacity as each other
Ive now got around 1000 cells that I have recovered from old leptop battery packs. I now have them all tested and re charged and have also got them all set aside in boxes grouped from 1500 ma to
2850 ma. Ofc I dont have many at or close to the 2850 range.
I boxed them like this 1500 to 1650 then 1650 to 1750. 1750 to 1850 and so on right up to 2750 to 2850 and higher.
My question is on grouping the cells to make my 14s battery. I have seen that some of you dont use cells that are more than 200 ma between the highest and lowestcapacity. Unfortunately I dont have enough cells that are with in this range to build a battery large enough to be worth while so Im asking what you guys think would be the down side of using cells with a larger difference would be or is it simply a very bad idea. ????
Of course I would build each pack so that all 14 packs had the same total capacity as each other and the same number of cells in each pack as well.
If for example I had the highest cell in a pack at say 2800 ma and the lowest cell at 2200 ma capacity would it work like this during charging and discharging. As apack started to discharge the lower capacity cell would start to loose voltage faster than the highest one so the highest one would give out more to compensate so that when the pack was flat each cell would still be at the same voltage as all the others in the pack. And during charging the opposite would apply the larger capacity cells would absorbe more charge than the low capacity ones.
If Im corect then it shouldnt matter if a pack has different capacity cells providing the total capacity of each pack with in the 14s battery have the same total capacity as each other