We just took delivery of a new 3rd party power extension grip meant for DJI Pocket 3.
As with the previous unit that we've bought, we opened it up to check its internal cell and designs.
Similarly, this Skower unit uses a 21700 cylindrical lithium cell, but rated at 3.7v 5000mah as compared to the aMagisn unit.
This power extension grip is capable of Power Delivery 5v 3amp, 9v 2amp and up to 12v 1.5amp. The previous unit is purely a 5v 3amp design, which we think is not PD compatible.