[What's_nitro?]

LiPos do something funny when they sit around for a looong time. I had some packs that I hadn't used for over a year because the car they were used in wasn't running anymore. They showed good voltage and were in perfect balance, but when I cycled them there was no usable capacity left. I mean, it was a 5000mah pack and I only got 200mah out of it (after multiple cycles). I honestly wouldn't bother with testing the old packs. Just get some new ones. Zippys are great, especially for the money. Just don't expect any warranty service from China (it's cheaper to buy new ones than send them back for replacement).