This is a 5V Step-up booster module for Lithium Battery Charging and protection Protection. It can be used for DIY power bank as it can provide 5V 1A output voltage with the input of 3.7V.

Features and Specifications:

• Battery discharging stop voltage: 2.9V.
• Charging and discharging indication.
• Internally installed charging and discharging power MOS.
• Preset 4.2V charging voltage, precision ±1%.
• Max 8uA standby current.
• Integration charging management and discharging management