PowerBoost 500 Charger – Rechargeable 5V Lipo USB Boost @ 500mA+: PowerBoost 500C is the perfect power supply for your portable project! With a built-in battery charger circuit, you’ll be able to keep your project running even while recharging the battery! This little DC/DC boost converter module can be powered by any 3.7V LiIon/LiPoly battery, and convert the battery output to 5.2V DC for running your 5V projects. (read more)
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Beware. The low power pin will go as high as the battery voltage. So with the used LIPO it will put 4.2Volts on your 3.3Volt input of your PI. I’ve done something similar with my Pi, but I’ve put a diode (1n4148) to lower the voltage and a resistor to lower the current between LOBat and GPIO.