DIY Power Bank Module 3.7V 1s Li-ion Battery, 5V Output

This compact DIY Power Bank Module allows you to build custom portable power sources using 3.7V lithium-ion batteries such as 18650 cells. It integrates charging and boost output circuitry into a single ultra-small circuit board, making it ideal for compact projects, DIY power banks, and portable electronics power supplies.

Key Features:
-Standard USB Type A port provides 5V 1A power output to charge connected electronics.
-Micro USB port serves as the battery charging input.
- Built-in LED indicators show powerbank status.
-Direct solder pads marked for B plus and B minus connection to a 3.7V lithium battery.
-Ultra-compact footprint measuring approximately 20 mm wide,

Ideal for DIY portable power banks, custom battery cases, and mobile electronic projects.

Important Notes:
- Idle battery current consumption: 10mA approx.
- NO low battery cut-off function.
- Old stock Module sold at discount.