UPS Module with Li-Pol battery for Raspberry Pi Pico - Waveshare 20121

The overlay designed for Raspberry Pi Pico, acts as an uninterruptible power supply (UPS) in case of a sudden power failure. It also allows to monitor battery level via I2C interface. It comes with a male GPIO pinout connector from the Raspberry Pi Pico module, which allows you to connect multiple overlays and create so-called stacks. The kit comes with a 600 mAh Li-Pol 3.7 V battery with JST 2.0 mm connector.

• Li-ion and Li-po batteries are quite unstable. They can cause fire, personal injury, or property damage if not charged or used properly.
• Do not connect the terminals in reverse when charging or discharging batteries. Do not use an inferior charger/charging panel to charge the batteries.
• Do not mix old batteries with new batteries, avoid using batteries of different brands.
• When buying a lithium battery, always make sure that the battery specification is compatible with the expansion board. Choose batteries from an official manufacturer and make sure the batteries will work stably and safely by performing an aging test.
• Lithium batteries have a limited life cycle and will deteriorate over time. They should be replaced when the batteries have reached their maximum life cycle or have been in service for more than two years, whichever comes first.
• The battery should be placed carefully and properly, keep it away from flammable and explosive materials, away from children, avoid accidents caused by careless storage.

• Standard Raspberry Pi Pico connector
• Built-in charger chip for Li-Pol batteries with dynamic power path management
• Communication via I2C, real time monitoring of battery voltage, current, power and remaining battery capacity
• Protection circuit against overcharge/discharge, overcurrent, short circuit and reverse connection
• Built-in charging, power indicator, easy to check battery status

1. Charger chip ETA6003
2. Voltage / current monitoring circuit INA219
3. Li-Pol battery protection circuit S8261
4. Li-Pol battery protection MOS FS8205
5. MOS back-up protection A03400
6. MOS reverse current protection circuit SI2305
7. Raspberry Pi Pico connector
8. Power switch
9. Button to activate protection after battery change
10. Battery connector

• Charging voltage: 5 V
• Communication: I2C
• Supported batteries: Li-Pol 3.7 V 600 mAh
• Dimensions: 60 x 21 mm

• UPS cap for Raspberry Pi Pico
• Li-Pol 3.7V 600 mAh battery

• Manufacturer website: Waveshare 20121
• User Guide