Schumacher SP-1 2/4-Amp 6/12-Volt Automatic Battery Charger/Extender

• Automatic charger for 6- and 12- volt batteries
• 6 Volts at 4 Amps, 12 Volts at 2 Amps
• Automatically determines if the battery is 6 or 12 volts
• Quick Connect Harness easily changes between battery clamp and ring terminals
• Ideal for power sport vehicles, motorcycles and small cars

This product is a perfect 2amp charger for long term battery maintenance. It is NOT a fast charger and isn't designed for rapid charging of a fully discharged battery. It is designed to be plugged in and left on for long periods of time. While 2 amps may not seem like much, competitors products of which I own 2 as well are typically only 1amp. Here's the breakdown,

PROS

Easy to understand LED readout

Multiple connection types (Hard Wire, Clip)

Solid and Rugged feeling plastic case

Lightweight design (Compared to metal housings on others)

Buy Schumacher SP-1 2/4-Amp 6/12-Volt Automatic Battery Charger/Extender Now

The product properly maintains my motorcycle battery as described, but it emits a high-pitched humming noise very similar to the every day ringing in my ears (tinnitus). The noise is constant whether maintaining a batter or not.. the unit just has to be plugged into the outlet. Friends who are in the garage for a few minutes always ask me "What's that sound??". The product works fine but I might switch brands if I ever need a new one.

Read Best Reviews of Schumacher SP-1 2/4-Amp 6/12-Volt Automatic Battery Charger/Extender Here

I typically like Schumacher battery products, for the money they are much better than Battery Tender chargers. That said, this is ONLY a 2 amp charger and not capable of 4 amps (which would make it good for cars as well). So don't purchase it for cars, motorhomes and boats unless you want something only to maintain a charge.