Last year we wrote about a two dollars USB 18650 battery shield that allows you to easily power your board over USB using a 18650 LiPo battery. But if you need some more flexibility, and extra features such as reverse polarity protection, PGCPSU, which stands for “Pretty Good Cheap Power Supply Unit”, may be worth looking into.
- Power Input – micro USB input or pin header for charging (4.7V to 6V max.)
- Power Output
- 5V rail providing at least 350mA, and up to 650mA
- 3.3V rail providing at least 400mA, and up to 800mA
- Integrated battery protection including reverse polarity protection
- Over-discharge, short circuit/over-current protection
- Power Efficiency
- High efficiency even at low load, important for long battery life
- Low quiescent current (49uA for the 5V rail + 57uA for the 3.3V rail)
- Enable/disable pin for the 3.3V rail with selectable default state solder jumper
- Charging – Quick charging at up to 1.9A (fully charges a 2,600mAh cell in about 2 hours)
- Dimensions – 25x20mm
They also reported battery life with a 2,600 mAh battery that is included in some of the kits for different scenarios:
- 3.5 days for Arduino Blinky sketch.
- 17 hours for a Raspberry PI Zero W posting its uptime to a REST API via WiFi
- Over 4 months and still running for an ESP8266 based soil moisture and temperature sensor that is posting a measurement every 10 minutes; same result for an ESP8266 based WiFi / PIR motion sensor
The module can also be used as an uninterruptible power supply.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.