Let jester check them for you and you can learn something in the process. THe only good way to check the pack is to cycle the pack a couple of times. When I get a new pack these days I cycle them about 4 times to get them up to there max. Then a couple of times a year I pull my packs and cycle them again to make sure they will go p to about 80% of there capacity. I saw that mentioned by 42. A volt meter is a good tool but you can only tell if a pack is any good by cycling. If it shows up bad on a volt meter it is way past time to toss it. Meet up with the jester, pick his brain a while. I us a cycler fom Hanger 9 and one from Hobbico. I think Hobbico products are crap but I do have one of there chrgers/dischargers so I can say that. I have used a lot of there products over the years and never been happy with there products or service. If I need a new electrical product I go to hanger 9 first and look at therre products.