S-8160A is a lightweight 190Wh Gold-mount battery, it has a 4-level LED indicator to give the user a view of remaining power before mounting to camera, and a connecting shoe for wireless receiver S-7002. SC-304A is a 2-channel simultaneous charger for gold mount batteries, which can automatically recognize the type of battery being charged (Li-ion, Ni-MH and Ni-Cd).