LORDWORLD UPS HAT (D) development board 21700 battery pogo pins

UPS HAT for Raspberry Pi boards

The LORDWORLD UPS HAT (D) is an uninterruptible power supply add-on designed for Raspberry Pi 3, 3B+ and 4B models. It accepts a single 21700 lithium-ion cell to keep the Pi running when mains power is lost. The board uses pogo-pin contacts so no GPIO pins are consumed, leaving the header free for other HATs or sensors. Makers building portable or headless Pi projects gain continuous operation without rewiring.

Dynamic path management and thermal behaviour

Dynamic path management allows the HAT to charge the 21700 cell while simultaneously delivering a stable 5 V rail to the Raspberry Pi. In normal use the board runs passively with no fan, so acoustic output is effectively zero. Power draw is limited to the Pi’s own consumption plus the charging current, keeping heat low enough that no active cooling or heatsink is required. The design targets reliable operation in enclosed or space-constrained enclosures.

Build quality and daily mounting implications

The pogo-pin array presses directly onto the Pi’s power pads, so alignment must be checked each time the HAT is seated. No soldering or screw terminals are involved, which speeds up board swaps during development. Because the battery is not included, the user must source a genuine 21700 cell and verify its protection circuit matches the HAT’s expectations. The compact footprint sits flush with the Pi’s outline, allowing standard cases to close without modification.