Maintaining a consistent voltage is also important for charging speed and battery protection. A few volts above a battery’s rating are acceptable and even desirable, but a car battery charger must produce at least 12.0 V to charge a 12.0-V battery. A higher voltage will charge a battery more quickly, but too many volts can damage your battery. Batteries that charge a car faster received a higher rating in this category. īy considering a battery charger’s voltage and amp hours, you can determine the approximate charging speed. We started the battery charger according to the instructions and measured the voltage using a multimeter. To test each car battery, we unpackaged it and attached it to a 12.0-volt wet cell battery. Each car battery charger was given a rating out of 5.0 stars based on these criteria. A team member tested each product on a 2004 Subaru Forester, taking note of how quickly the car battery charger could charge a car battery, versatility, ease of use, and value. Our product testing team then ordered the car battery chargers that best met these standards. We started by searching retailers like Amazon, RealTruck, and Advance Auto Parts for top products, looking at factors such as battery type, voltage, customer ratings, and prices. The car battery chargers in this article went through two rounds of review.
