Lithium Charge Controller With 2.5mm Jack
This is a simple lithium battery charge controller for use with 3.7V lithium ion and lithium polymer batteries. The PCB is marked for easy soldering. Power input is achieved through a standard 2.5mm barrel jack.
To charge an attached battery plug in a 4.5-5.5V DC power source to the 2.5mm barrel jack. The board has a maximum current rating of 1A and uses linear charging. The board uses two small LEDs as indicators, with RED during charging and BLUE when the battery is full.
Warning: Lithium batteries are in nearly every gadget we use and are, in general, safe. However they can start a fire or become deadly if handled improperly.