How do I extend my iPod battery?

My 4-year old iPod Nano does not keep its battery charge for long. Even when not used at all it is flat in a few days. I use it when away skiing for outdoor skating and when in my caravan. Do you have any tips for increasing running times?
Carol West, by email

The lithium ion battery in your Nano is rapidly approaching the end of its useful life and it is not unusual for them to lose up to 50 percent of their original capacity after four or five years constant use. Even when new this type of battery has reduced capacity in cold conditions. At this point I usually suggest that if you have a modicum of DIY skills, you can make significant savings by replacing the battery yourself, but not this time, iPod Nanos are fiendishly difficult to work on.

You could be in luck if you have a first generation Nano and qualify for a free replacement. There was a manufacturing defect on some batteries used in this model that caused them to overheat; there are more details at: http://goo.gl/AHwKH. Otherwise Apple’s official battery replacement service (don’t forget to backup your library) will set you back around £46.00. High street repairers are usually cheaper but you run the risk that they could fit an inferior quality battery and you will be no better off, or damage your player. In short, it may be time to start saving for a replacement.