We use the TPS61232 step-up boost converter from Texas Instruments that offers up to 96% efficiency. The board includes power on and battery low indicator LEDs. During shutdown (due to under-voltage or external selection) the quiescent current is just 15uA sip.
The MagPi described LiPo SHIM as “a slick bit of kit” and “a great option for providing safe power for a portable project” in their four star review.
- 0.8mm thick PCB
- Shaped to sit as low as possible on the Raspberry Pi
- 2-pole JST connector ideal for most LiPo/LiIon batteries
- Power and low battery LED indicators
- Supplies up to 1.5A continuous current (15uA quiescent current)
- Low battery warning at 3.4V (asserts GPIO #4 low)
- Automatic shutdown at 3.0V to protect your battery
- VBAT+, GND, and EN pins available to break out
- 2×6 0.1″ female header (optional, for non permanent installation)
- Includes rubber foot to space LiPo SHIM away from your Raspberry Pi
- LiPo SHIM pinout
- Compatible with Raspberry Pi 3, 2, B+, A+, Zero, and Zero W
- Requires soldering
We’ve put together a one-line installer that will initiate a clean shutdown when the low battery warning is triggered and GPIO #4 is pulled low. More details are available here in the GitHub repository.