Olympus OM-1n Strip Down — Simon Hawketts' Photo Blog
Olympus BLN-1 Spare Camera Battery for OM-D E-M5, E-M1, E-M5 Mk II Cameras
Synergy Digital Camera Battery, Compatible with Olympus BLH-1 Digital Camera, (Li-ion, 7.4V, 2250mAh) Ultra High Capacity, Replacement for Olympus BLH-1 Battery - Walmart.com
Olympus OM-1: dead meter or wrong battery?: Olympus SLR Talk Forum: Digital Photography Review