Well I bought two of these series 5 5000mah batteries and two stock 3000 mmah batteries from a ebay auction that the guy ended early. I took them home put them on my Onyx 245 and started charging them at 5amps after about 20-30min one started to smoke I unplugged the charger took the battery outside and after about 15min this is what it looked like. Anybody have a clue what happend. He said there was less than 10 runs on the batteries all the other batteries charged fine. I only have nimh. I paid him cash not sure if I should say something or not to him. The batteries looked new.