HP Digital Camera Care: advices that attention should be paid to batteries:
-'Do not expose batteries to temperatures above 110 degrees F (43 degrees C). For example, leaving batteries in your car in the hot summer sun can result in permanent damage. Your best bet is to store them in a place thats cool and dry.
- Do not overcharge the batteries.
- Do recharge your batteries before or after long-term storage. Batteries discharge over time, and if not recharged they may leak and corrode the camera.
- Do not mix old and new batteries or batteries of different types.