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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br />
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== Summary ==<br />
The Waveshare Li-ion Battery HAT (part number WSAL15141) is a Raspberry Pi expansion board featuring a switched 5V output and bi-directional quick charge. It uses rechargeable 14500 lithium batteries (3.7V nominal) and can power the Pi via the GPIO header or USB connections.<br />
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== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL15141 WSAL15141 – Li-ion Battery HAT for Raspberry Pi, 5V Output, Quick Charge]<br />
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== Technical overview ==<br />
* The battery must be charged for about one minute before first use; without this activation step, the module produces no output.<br />
* Five LEDs indicate discharge state: their on/off/blinking pattern corresponds to capacity ranges from 80–100% down to 0%.<br />
* During charging, the five LEDs follow a similar logic across capacity ranges from 100% down to below 20%.<br />
* The module cannot function as a UPS: disconnecting the AC adapter causes a brief power interruption that reboots the Raspberry Pi.<br />
* The micro USB port can directly power the Raspberry Pi's USB power input.<br />
* Due to its height, stacking additional modules on top is not possible.<br />
* Battery specification: rechargeable 14500 cell, 3.7V nominal, 4.2V full charge, 3V cutoff voltage.<br />
* An 800mAh battery powers a Raspberry Pi 3B+ for about 50 minutes and a Raspberry Pi Zero W for two to three hours at idle.<br />
* Larger capacities are achievable by soldering, though this is not recommended for non-professionals.<br />
* Output capability: up to 4A current with up to 96% conversion efficiency, per the chip datasheet.<br />
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== Notes and version constraints ==<br />
* No commands are specified in the source text; therefore this field remains empty.<br />
* Do not use as a UPS – unplugging the charger causes a brief reboot of the Raspberry Pi.<br />
* Insert the battery with correct polarity; reversed connection triggers the warning LED and requires flipping the cell.<br />
* Do not mix old and new batteries or cells from different brands.<br />
* Lithium cells age both cyclically and chronologically; replace them upon reaching maximum cycle life or after two years.<br />
* Only use compatible, tested 14500 cells; ordinary non-rechargeable cells will not work.<br />
* Do not connect the charging cable while replacing the battery.<br />
* If there is no output: check connection polarity and note the warning LED.<br />
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== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Li-ion_Battery_HAT Li-ion Battery HAT - Waveshare Wiki]<br />
* Source revision: 110856<br />
* Captured: 2026-08-31T02:40:18+00:00<br />
* SHA-256: <code>5e7fc9758271d40fc2ba75fd2ed9a64ba6863828aade5787fb70bf7193bad449</code></div>JWTechPublisher