I use rechargeable AA batteries, because it charges 4 AAs in 15 minutes and I can use them for everything else that requires AA or AAA batteries. So is it rechargeable batteries, rechargeable battery packs, throw away batteries, or maybe you would prefer built in batteries like ps3.

I got a recharge battery pack set for about £15, with two battery packs, so I can charge one and use the other.

It’s been great, and I can’t be arsed with replacing AA batteries all the time.