Tenergy Lifepo4 2500mA battery help

[pjoseph]

I purchased 4 of the above battery cells and made two 2s battery packs each cell wired in series giving me 6.6V per pack.

I also made a harness putting the above two packs in series to give me 13.2V

When i initially charged them i used a balance harness and the cells all had matching voltages.

I am using these packs to power a small 12v heat strip which i use to warm up my nitro engine prior to starting. I eneded up forgetting to bring my voltmeter when i went. When i returned and measured the two packs one cell in each pack had droped to around1v and the other cell in each pack was around 3v.

I am wonder what causes such a big difference in cell voltage? Also what is the best way to try and salvage the two cells that are around 1v? I tried charging them together as they are but would get a low voltage error from my charger?

Thanks

[Four Stroker]

Due to manufacturing tolerances cells are never exactly the same. Near the end of charge they all go wonky. For such an application you should buy a protection circuit. Google "Battery Protection Module". It will disconnect the battery at low or high voltage per cell. NOT FOR FLYING.

[Four Stroker]

Shop Here: http://www.all-battery.com/search.as...=497&log=false

LiFe at bottom and page 2.