The LUMIX S Series S1 and S1R have an optional battery grip, the BGS1. This is a tour and explanation of how to use it and what it can do!
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Hardware: LUMIX S1 & S1R DMW-BGS1 Battery Grip
If you own a LUMIX S1 or S1R, odds are you'll want the Panasonic DMW-BGS1 Battery Grip to go with it.