With this charger board lithium polymer batteries can be charged via Mini USB. Technical data - Input: Mini USB type B socket - Output: JST PH 2.0 2-pin female - Input voltage: 5 V - Output voltage: 4.1 ... 4,5 V - Charge current: 500 mA - built-in chipset: MCP73831 LED status - fast flashing: no battery connected - permanently lit: Charging - very faint glow: wrong polarity - off: Battery fully charged