i would like to recharge through the main power socket using a usb adapter cable (they sell them for mobile phones so you can charge them from your pc). the question is is 500ma enough to prompt the nokia into charging. the mains charger is 5v 890ma (strange amperage). if 500ma is enough then there is also the possibility of using something like the Battery Pack for iPod PW-2882p which has a 2800mah lithium battery (£18) if it is not enough does anyone know of a battery pack which can supply 1000ma and is available for sale in the uk?