i have Rayovac hybrid 2100 mAH. everytime it needs to be change 1 battery is dead and the other 3 has little power left. is it suppose to do that. but it does last me maybe 2 1/2 days. really doesn't matter to me i always have back up rechargeable batteries. on the instruction book it recommends to use radio shacks 1800 mAH. should i use that instead. what do u guys think is a better rechargeable battery for the pro 96.