Look at the date. If over a year, change it.
I bought a Zi8 used, came with the I assume original Kodak battery.
The darn thing wont charge, if I plug it into the wall the charging light wont come on. It will show on the camera that it's plugged in (It recognizes that) but it wont charge.
Could it just simply be that the battery is old and wont charge anymore?
Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic