This powerbank has been tested with the GemLight Super, and is the least-cost recommended power source. Not only is the cost of a powerbank much less than the cost of batteries and a charger, but it is only about the size and weight of a smart phone! The GemLight Super may be used with other powerbanks but this one provides a run-time of about 10 hours, is low cost and rechargeable with standard USB charging ports. Charge time is around 6 hours, or nearer 4½ hours if fast-charging using USB-C. Capacity 10,400 mAh/38.48 Wh. Effective use with this powerbank is guaranteed.