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This 3A charger was originally designed to work with small batteries such as those commonly used in motorcycles. It is possible to charge a car battery using this device but it will take a lot longer.
The motorcycle battery charger works with a steady current to 14.1V. When this level is reached, the current charge drops automatically to a safer 13.6V level and keeps charging at this slower rate until the LED lights up indicating that battery has been completely charged.
For a few other car gadget circuit ideas, have a look at Cruising: Gadget Freaks for your car.
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