I have 3 sets of GP3300s (7 cell) battery packs that I am having a hard time with. Perhaps they are done for, but looking for some advice before I scrap the cells or the charger.
They were sitting unused for about a year. I pulled them out and charged them on a MRC superbrain 969. They only took about a 400MAH-600MAH charge, plugged them into a visionpeak and it saw them at 25%. Charged them individually on this charger ran them.(decent run time) On the next cycle they took about 2500MAH charge on the MRC, used them again and after about 4 cycles they were taking a full 3300MAH charge again.
This was about 2 weeks ago, pulled them out again and same thing. First charge aprox 600MAH, second 1500MAH, and now on the 3rd cycle currently at 2200MAH and still going. The vision peak only shows 25%-50% charge and the are showing 10.4V on the multimeter after the 1500MAH charge.
Any advice is much appreciated!