Fortunately, single-chip solutions are now widely available for Li-Po battery charging. ... (5V) from a laptop, and external dc input (6V) from a lab power supply. Charging current for the battery ...

Adafruit PowerBoost 1000 Charger Offers Rechargeable 5V Lipo USB Boost. ... – Low battery indicator LED lights up red when the voltage dips below 3.2V, optimized for LiPo/LiIon battery usage ...

The material is electrochemically stable and can withstand voltages of 5V or more. It is also non-flammable, meaning it will not ignite even when exposed to fire.