• for single-cell 3.7V LiPo battery
• boosts battery voltage to 5VDC 800mA (feed to Arduino 5V pin)
• operation is based on charging IC MAX17043G+U
• charger IC control and monitoring via I2C bus (pins A4 and A5)
• charge current set to max. 500mA
• battery connected to the board charged via miniUSB port (charging mode selectable by switch)
• Alert interrupt from the charging circuit routed to Arduino D2 pin (activates if state of charge <32%)
• four indicator LEDs show battery and charging status
• suitable battery connector JST PHR-2 female

Links

• Eagle files
• MAX17043G+U
• MCP738312
• Elecrow Wiki link (User manual)