Hello, I have a NASCAR Advantage Schumacher 2/10/20/80A Fully Automatic Microprocessor Controlled Car Battery Charger. This car battery charger will fast charge @ 20A, regular charge @ 10A, and will do a 80A battery boost. It will also charge smaller batteries like a motorcycle battery. Everything is automatic, and it has a LED interface which will show you the battery %, the battery voltage, and the alternator output.