This is the DMW-BLC12 Rechargeable Lithium-Ion Battery from Panasonic. Small and lightweight, lithium-ion batteries can be charged or discharged at any time without developing memory effects.
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B&H had the exact match to the Panasonic battery model that came with the camera. I like to have a fully-charged spare battery when going on a hike or a planned photo shoot.
I've had my Lumix camera for 6 years now, with the camera used to take 2000-3000 photos twice per week, and my original batteries were swelling up and I had trouble getting them out of the camera, so I bought two replacements. They work great. I'm able to take 2500-3000 photos over a 4 hour period (without flashes, of course) with a single battery with these new batteries. Much better than what I read about the cheaper, fake batteries available elsewhere.