I use USB-A ports on a dumb charger, but most likely, it'd be best for the battery to use a charger with PPS support (programmable power supply - the device can

I use USB-A ports on a dumb charger, but most likely, it'd be best for the battery to use a charger with PPS support (programmable power supply - the device can request finely tuned voltages, reducing losses and thus heat inside the device).