OM System BCX-1 Dual Lithium-Ion Battery Charger

The BCX-1 takes two BLX-1 batteries and charges both together in roughly 150 minutes, which is the difference between an overnight turnaround and a lunchtime one. It is USB-C powered rather than mains-only, so it runs off the F-7AC adapter, a laptop supply or a power bank of adequate rating.

Power Delivery 3.0 compliance is the useful detail: give it a 9V 3A source and it charges at full rate, which means one PD power bank in a rucksack can keep a two-battery OM-1 kit running for days away from a socket.