Regarding charging, the 511EB charges via USB so you can get a 1000mA charger on Amazon for about £3, if not less, including delivery. I recently got a USB car charger for £1.40 delivered.

Note also that you can get 8% of the price back if you buy via Quidco.com. Quidco take the first £5 that you earn in cashback as their admin charge, but this is a one-off annual fee.