Exploding and overheating batteries seem to be dogging the mobile electronics industry. The latest to be hit? Nokia. Their BL-5C batteries (found in both the N70 and the N91, both of which I own) are now under a recall. The battery in question was made by Matsushita between December 2005 and November 2006, and is the most common battery in Nokia's kit-bag.
To find out if your batteries are affected, and how to obtain a replacement, visit Nokia's battery replacement website.