I bought one of these batteries a few years ago for my Sony Hi8 camcorder. Used it a few times and it was great, got some good life from it. However i put the battery away with my camcorder for a few years and forgot about it. Recently i've dug it out and tried to use it again, completely dead, will not charge no matter how long i leave it connected to the charger. Strange thing is, the original NP-FM30 battery i had with the camcorder is fine, charges up and works nicely. I have no idea why this battery will no longer work/hold any charge.