lithium battery charging board

this is a charging PCB for a lithium battery, maximum 4.2V.

specifications:

• charges lithium ion battery up to 4.2V with a 5V 1A USB input source
• over-charge protection of 4.3V
• under-charge protection of 2.9V
• input specs: 5V 1A (USB standard)
• 180mA trans current
• red LED = charging, green LED = charged, blue LED = load on USB port (has footprints for adding 3mm breakout LEDs)
• ~ 50mm x 20mm x 9mm