OM System UC-92 Lithium-Ion Battery Charger

The Tough cameras charge over USB in the body, which means the camera is out of action while it does so. The UC-92 is the external charger that breaks that dependency: put the spare in it, keep shooting on the pack in the camera, and swap when the light changes.

It takes both LI-90B and LI-92B batteries, runs on 100-240V so it travels without a transformer, and outputs 4.2V at 0.7A. Compact enough for a dive bag or a rucksack lid pocket.