BLN-1 Dual Battery Charger Build-in USB Cable Compatible with Olympus OM-D E-M1 OM-D E-M5 OM-D E-M5 Mark II Pen E-P5

Works and can charge two batteries for an OMD-EM-1 at the same time. Has a weird power supply requirement so if it doesn't charge, try using a bigger than normal brick and not one with anything fancy (5V 2a).

Can charge 1 or 2 batteries at once. My not be as fast as in camera charging, but much more convenient.

This charges genuine Olympus batteries and third-party batteries quickly and easily. Being able to charge two batteries at one time is a great option when you need it. Buy it, you won't be disappointed.

This charger is for the battery for an OM-1. It works. It is somewhat slow at charging but for the price (compared to the OEM charger) it is an acceptable choice for me and is good value. I have extra batteries and usually charge in-camera so this charger is mostly for convenience.

The listing clearly says that it has a built-in cable AND a USB C input. That is a lie, there is no additional input of any type. That means the little short USB A cable is the only connection, and unless you buy an extension this will always have to within 5-6 inches of a charger. The listing lies.

Faithfully charges my Olympus PEN E-P5 batteries. The indicator LEDs are a bit simplistic and it feels very plasticky and light... but has survived multiple trips and I really REALLY appreciate the integrated charging cable (even though it's pretty short). Solid buy for me.

Has a similar flashing charge indicator and auto shutoff as the OEM charger. Compact and accepts a USB input for 12V charging.

Used it for about 8 months. Works well but a bit slow. I have four batteries so it is not a problem for me to rotate them. Works well with 120 and 220 V.