Amazon.co.jp: Power-connoisseur BLN-1 Replacement Battery, 7.6 V, 1600 mAh, Large Capacity, PSE Standard Inspection, Compatible with Olympus Olympus OM-D E-M5, E-P5, OM-D E-M1, OM-D E-M5, Mark II Digital SLR Cameras : Electronics
Olympus OM-1 Camera Batteries & Charging Options
Buy - OM System BLX-1 Battery for Olympus OM-1 - UK Digital
Olympus BLX-1 Battery (2-Pack) and USB-C Dual Charger by Wasabi Power
Amazon.com: IBATTS 2 Pack BLX-1 Battery and LCD Display Dual Battery Charger for Olympus OM System OM-1 OM1 BLX-1 BLX1 Blx 1 SBCX-1 Lithium-Ion Replacement Camera Battery- 7.2V 2000mah 14.4wh : Electronics
Olympus HLD-10 Battery Grip For OM-1 | Ted's Cameras