@Edent I'd think they wouldn't be able to hold as much charge as a regular rechargeable simply due to space needs of the port. Happy to hear they seem ok in usage as they just struck me as a Frankenstein yolo haha. Probably best use case is needing a charge away from a regular charger. Seems like if you used these en masse your just trading the regular bulk set charger for a 6-10 USB port adapter plus separate cables. I suppose if the C port could charge fast enough it might make almost continuous field use possible with minimal extra batteries to carry. For my battery lawn mower, I can basically charge one battery during the use of a 2nd, so it just swaps back n forth with almost no downtime