5v input USB-C, Micro and USB-A chargers, with green and red charge indication LEDs. Suitable for all 3.7v Nora li-ion battery packs and battery holders.
Constant current 1 amp charge, until 4.2v, then current decreases over time at constant voltage (the slower last 5% part of the charge cycle). Starts with a trickle charge if the voltage is very low to protect battery. Constant current element of charge cycle potentially limited by output rating of the USB power supply used, resulting in increased charging time.
Note - battery chargers will get warm to the touch in operaton (not to the extent that they can't be handled with care). Use with appropriate care, and charge batteries in a fire safe environment and under supervision. Use an elastic band or similar to secure batteries if charging using battery holder as a cradle.