Note: The following is part of our roundup of B-C battery packs. Go there for details on how we tested this device.

msing’s Gr A2 us looks a lot like the first battery packs to hit the market years ago. Roughly the same thickness as a typical wall wort, slightly bigger in size than a deck of playing cards, there’s nothing new to the design of the pack.

msing offers three color combinations on its Amazon storefront, including black with orange trim, gold with white trim, silver with blue trim.

Three ports are located on the front: A B-A port offers QC 2.0 QC 3.0 speeds, a B-C ports for charging the battery your personal devices, finally a microB port for charging the pack itself.

th a capacity of 13,400mAh (49.58), the Gr A2 us found itself ranked dead last in our efficiency test at 72.71 percent— it’s not even close. It’s the only pack we’ve tested thus far to fall below 80 percent, with the Tronsmart esto sitting at 80.17 percent efficiency.

In other words, the Gr A2 us only transfers 72 percent of its total capacity to another device. It’s important to note, battery packs are never 100 percent efficient. There’s a myriad of reasons for that, including temperature the device it’s connected to.

A convenient feature the Gr A2 us does offer is a small flashlight to the right of the microB port. A button on the right side of the pack controls the flashlight. It’s bright enough to help find something inside a purse, under a chair, or for use as a reading light on an airplane.

On top of the pack you’ll find four blue indicator lights, each one representing a 25 percent level of charge in the battery. The lights activate with a quick press of the button, or whenever the battery is connected to a device for charging. kewise the lights blink as the pack is being charged, letting you know its status.

Total charging time for the Gr A2 us was right at five hours, two hours more than similarly spec’d Tronsmart esto.

Included with battery pack is a small B-A to microB cable.