Works, but could be better
"As is often the case with Chinese technical products, the documentation is brief, often ambiguous, and less than comprehensive. The unit will not accept 18650 cells that are actually 18 x 65, presumably to require cells that have integrated protection circuits. This excludes cells that are of the correct dimensions that do in fact include such circuity. Exporting the safety-critical battery management to the battery is, IMO, a poor design decision. The electrical contacts in the battery chamber are less than optimal; for instance, during a charge cycle, simply picking up the unit may cause the charge current to drop from 500 mA to 10 mA for no obvious reason. The firmware's idea of what the state of charge is can be an apparently random variable. That said, it often did an adequate job of charging various devices. Charging devices through the USB C port may or may not work, depending upon whether it does or not -- iPhone yes, flashlight no."
