I generally buy the OEM offerings. OEM specifications labeled on the battery pack: LUMIX Panasonic Model NO DMW-BLD10PP 7.2V 1010mAh 7.3Wh Li-ion I desire a higher mAh (milliamp hour) rating for greater longevity. I prefer Li-ion (Lithium-ion) for the greatly-decreased memory effect. This is for my GX1. Anyone have any recommendations?