Nikon is recalling certain serial number batches of the EN-EL3 battery, due to a over heating problem that may occur during recharging.
Owners of the Nikon D50, D70, D70S and D100 should check their EN-EL3 serial number here and return their battery to their local representative for replacement if it matches.
To find the serial number check the bottom of the battery:See also:
Nikon EN-EL3e false low-battery warning problem. Possible solutions
Nikon service advisory for a power related problem with the D5000