What battery voltage is required for this? The size is 18650, but there are multiple batteries on the market with different voltages in that size.

All 18650 batteries are 3.7 V ... the variance is the Amperes ... thus how long the battery will last. A higher capacity (mAh - milli Amp hours) battery will determine how long you can run off the battery. You choose based on money and purpose. More capacity adds weight usually (it should always technically). I generally go for more capacity, but thats me :)

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🔋 Power your Pi like a pro—never miss a beat!

SEAMLESS POWER BACKUP - Keep your Raspberry Pi Pico/Pico W running without interruption, even during power outages.
PLUG PLAY CONVENIENCE - Effortless installation designed specifically for Raspberry Pi Pico series—no hassle, just power.
SMART BATTERY MONITORING - 4 LED indicators plus serial port data give you real-time battery voltage and current insights.
DEVELOPER FRIENDLY DESIGN - All GPIO pins clearly labeled and accessible, perfect for rapid prototyping and experiments.
SAFE EFFICIENT CHARGING - Automatic charging stop with clear LED standby indicator ensures battery longevity and safety.

The GeeekPi UPS HAT is a compact, plug-and-play uninterruptible power supply designed exclusively for Raspberry Pi Pico and Pico W. It supports 18650 lithium batteries, features intuitive LED indicators for battery status, and offers detailed voltage/current monitoring via serial connection. With full GPIO breakout and clear silkscreens, it’s the ultimate power management expansion board for developers seeking reliable, portable power solutions.

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RAM	LPDDR4
Brand	GeeekPi
Series	GeeekPi UPS HAT
Item model number	GeeekPi
Operating System	FreeRTOS
Item Weight	1.76 ounces
Package Dimensions	4.72 x 3.19 x 1.65 inches
Color	Black, Green
Processor Brand	Broadcom
Number of Processors	1
Manufacturer	GeeekPi
ASIN	B09S5HJM6B
Date First Available	February 10, 2022

GeeekPi UPS HAT for Raspberry Pi Pico/Pico W, Uninterruptible Power Supply with 18650 Lithium Battery Charger and Power Management Expansion Board

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