Last week I moaned about the quality of those cheap mobile phone batteries you can get from eBay (Mobile batteries, cheap and nasty, or expensive; what a choice).

Part of my reason for wanting a spare battery is that my existing phone doesn't seem to charge properly. I use a USB charger attached to one of my machines. I use USB chargers because they don't sap so much power when the phone isn't plugged into it - compared to a wall wart that is - and they are a practical solution when I travel, because I only have to carry a load of cables.