I've been doing some research about batteries and I've stumbled upon Rechargeable batteries that come in 2500 2700 and 2900 mAh. Obviously they are 1.2 volts and I am looking to use 4 of them to power the micocontroller at 4.8 but I was wondering if one was better than the other . . . After some NiMH research I came across these batteries at www.vapextech.co.uk (2900mAh) and was wondering if 2900 would be the best way to go.