The TP4056 based VMA321 module is a complete constantcurrent/constantvoltage linear charger for single cell lithiumion batteries.
Specifications: - input voltage: 4.5 to 5.5 VDC (by onboard USB connector)
- charging current: 1 A adjustable
- charge accuracy: 1.5 %
- full charge voltage: 4.2 V
- charge indicator: green = fully charged red = charging
- working temperature: 10°C to +80°C
- weight: 10 g
- dimensions : 25 x 19 x 10 mm
- Sold as a pack of two charging boards
Schematic diagram of original VMA321 (without NTC) Rprog 1k2 = 1A: