It is usual that the higher the mAh the more the batteries will cost,
however to maximise the performance and get the best from your
appliances do not be tempted to save a few pennies.As a guide:AA range from 600mAh > 2500mAhAAA range from 550mAh >1000mAhC range from 2000mAh>2500mAhD range from 2000mAh>2500mAh9v range from 175mAh>200mAhWhen purchasing Rechargeable batteries make sure you check the mAh stated on the battery. The higher the mAh the more suited it will be for high drain appliances such as digital cameras.