From Nikon Malaysia Website
"It has come to our attention that some Rechargeable Li-ion Batteries EN-EL3 for Nikon Digital SLR Cameras may on rare occasions overheat causing the camera to deformed or in the worst case, posing a fire hazard
The Rechargeable Li-ion Battery EN-EL3 is a lithium-ion battery for use with Nikon D100, D70, D70S, and D50 digital-SLR cameras. Among these 4 models, it is supplied with purchase of the D100, D70, and D50. In the interest of our customers' safety, we have, as mentioned earlier, decided to implement a voluntary recall and replacement program.
Customers with recalled batteries should request a replacement battery as indicated below.
We sincerely apologize for any inconvenience this issue may cause you."
For more info of which battery to be recalled, please go here.
Luckyly my battery was not affected.