Acebeam has quietly introduced a high-capacity 21700 cylindrical battery under the model name AB21CP6425. The cell claims a capacity of 6,400 mAh, which translates to 22.4 Wh of stored energy. That figure is slightly below what the printed specifications might imply, as the images suggest the cell runs at a nominal 3.5 volts. By comparison, Nitecore’s NL2160HP offers 6,000 mAh at 3.6 volts, delivering roughly 21.8 Wh—making the Acebeam cell only marginally larger in practical energy terms.
Integrated charging and a familiar limitation
Despite the incremental capacity gain, the AB21CP6425 achieves remarkably high energy density because Acebeam has reserved space inside the cell housing for USB-C charging circuitry. In theory, even higher capacities would be possible without that feature. So far, the new battery has only appeared alongside the P20 Mini flashlight, and it can be recharged directly inside that host device. The integrated port means users could carry spare cells without needing a dedicated cylindrical charger. During a visit to the company’s Shenzhen headquarters several weeks ago, Acebeam representatives indicated they had succeeded in building higher-capacity cells but were not ready to specify a launch date.
Availability remains limited
The AB21CP6425 is not yet listed as a standalone product in Acebeam’s online store. The company appears to be prioritising shipments bundled with flashlights, which means detailed technical specifications—including the cell’s exact length—are still unavailable. For now, the largest 21700 battery sold individually by Acebeam remains the AB21CP56, a more conventional 5,600 mAh (around 20 Wh) cell rated at 3.59 volts. That model lacks a native USB-C port and is priced at approximately $22 for a single unit.