Battery performance might vary, depending on the type of batteries used. Roughly, a set of alkaline cells cast last for 20 images, and Ni-MH cells can last for 140 images, according to our test result. Minolta recommends the use of NiMH batteries only. You can use CR-V3 lithium Ion batteries, which can last for 230 images. We recommend using NiMH batteries, but placing one CR-V3 in your bag for important shootings as back up. Dirt on battery contacts is very likely to influence the battery performance. Before loading the batteries, strongly wipe both ends of batteries with a dry, clean cloth. Technically Ni-MH batteries are recharged less than the capacity, because of what is called "memory effect", when they are repeatedly recharged, before completely consumed. It is recommended to recharge the batteries only after the power is exhausted.