Amazon.co.jp: OLYMPUS BLS-50 Lithium Ion Rechargeable Battery for Mirrorless SLR Cameras : Electronics
Amazon.co.jp: Set of 2: OLYMPUS Compatible BLS-5 BLS-50 Battery and BCS-5 Compatible USB Charger Set, Roa Japan [PSE Standard Inspection] : Electronics
Olympus BLS-1, BLS-5, BLS-50, PS-BLS5 Battery (2-Pack) by Wasabi Power