Amazon.com : Wasabi Power Battery (2-Pack) and Charger for Olympus BLN-1, BCN-1 and Olympus OM-D E-M1, OM-D E-M5, PEN E-P5 : Digital Camera Batteries : Electronics
2 Watson DMW-BLG10 ID Li-ion Batteries for Lumix Cameras (7.2V, 1025 mAh) | eBay
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Third Party Battery Review – Watson and Wasabi Batteries - Photography Life