Adafruit Powerboost 500 LiPo Charger

Description

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.
To make this even more useful, Adafruit added a MicroLipo charger on the other side. The charger circuitry is powered from a microUSB jack, and will recharge any 3.7V/4.2V LiIon or LiPoly battery at 500mA max rate. There's two LEDs for monitoring the charge rate, a yellow one tells you its working, a green one lights up when its done. You can charge and boost at the same time no problem, without any interruption on the output so its fine for use as a "UPS" (un-interruptable power supply) for a low-current draw device. Just be aware that the charge rate is 500mA max, so if you're drawing more than ~300mA continuously from the 5V output side, the battery will slowly drain since the charge rate is less than the dis-charge rate.
Each order comes with a fully assembled and tested PowerBoost 500C + USB jack. Does not come with a Lipoly or LiIon battery, but we do carry one in the shop perfect for your battery needs (https://kjdelectronics.com/collections/adafruit/products/lithium-ion-battery-3-7v-2000mah?variant=29778536904) . Also doesn't come with the nice iPhone or charger cable.
If you're trying to figure out how much current your project is using, check out the Charge Doctor (https://kjdelectronics.com/products/adafruit-usb-charger-doctor-in-line-voltage-and-current-meter) .