Rechargeable 5V Lipo USB Boost

Can be powered by battery

Screenshots

Hunter's comment

This little dc boost converter modular any 3. Can be operated by 4 batteries and can be converted into battery out put to run your 5th project. This booster convent chip works like some very good actresses like Paris batteries. Synchronous operation means that you can completely disconnect the output by connecting an enabled pin to the ground.

Link

https://www.adafruit.com/product/1944