usb battery Charger

usb Battery charger schematic

The charger in this project is designed to charge two AA NiMH or NiCd cells of any capacity (as long as they are the same) at about 470mA. It will charge 700mAh NiCds in about 1.5 hours, 1500mAh NiMHs in about 3.5 hours, and 2500mAh NiMHs in about 5.5 hours. The charger incorporates an automatic charge cut-off circuit based on cell temperature, and the cells can be left in the charger indefinitely after cut-off.

Specifications

This charger has the following specifications:

• Size: 3.8″L x 1.2″W x 0.7″H (9.7cm x 3.0cm x 1.5cm).
• Cells: Two AA, NiMH or NiCd
• Charging Current: 470mA
• Charge Termination Method: Battery Temperature (33°C)
• Trickle Current: 10mA
• Power Source: Desktop, Laptop, or Hub USB port
• Operating Conditions: 15°C to 25°C (59°F to 77°F)

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