5v input USB-A and USB-C chargers, with indicator LEDs. Suitable for all 3.7v Nora li-ion battery packs and battery holders. With crafty monkey tail !
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 battery voltage is fairly low, and has protection to guard against charging batteries if voltage has dropped too low. Green & Red charge indication LEDs.
* Constant current element of charge cycle (1 amp) potentially limited by output rating of the USB power supply used, resulting in increased charging time.