The 10 Best Battery Desulfators
This wiki has been updated 10 times since it was first published in November of 2017. No matter how well you take care of a vehicle, the performance of its battery eventually diminishes over time, meaning it won't hold a charge as well it did in the past. However, that doesn't mean it should be thrown away. While these desulfators won't restore a battery to brand-new condition, they can help to extend its lifespan considerably. When users buy our independently chosen editorial recommendations, we may earn commissions to help fund the Wiki. Skip to the best battery desulfator on Amazon.
August 27, 2019:
I like to think of a battery desulfator in much the same way as an enzyme drain cleaner. Obviously, a desulfator and drain cleaner are two unrelated things, but they do work to clear away obstructions. When your plumbing gets clogged, for example, drainage is a problem. This causes potentially harmful (and dangerous) water backup, which directly affects the performance of the many appliances depending on a clear pipe system to function properly. For that reason, a good drain cleaner is needed to clear those pipes, restore normal water flow, and maintain the pipes in the long term to prevent recurrence. Now consider the problem of a neglected lead-acid car battery. If we're loosely comparing drain cleaners and battery desulfators, think of a car battery as your proverbial "plumbing system" and the process of sulfation as the "clog". Sulfation refers to the accumulation of lead sulfate (PbSo4) crystals on your car's battery plates. This crystallization decreases a battery's performance over time, preventing it from holding a charge. For the automobile battery, the solution to such a problem isn't drain cleaner, but rather, a battery desulfator, which works to dissolve the crystal sulfate from your battery plates, allowing the power source to operate more efficiently and extending its lifespan. While no desulfator is going to work miracles, it can definitely help to extend the lifespan of your lead-acid battery, giving you some extra time to consider a replacement.
Perhaps the most effective way to achieve successful desulfation is with high-frequency electric pulses. These pulses remove naturally-occurring lead sulfates from the battery plates and return them to the battery's electrolyte solution. Most of our options use this technology to operate, and many are capable of maintaining a charge for extended periods of time. The BatteryMinder 128CEC1 is one such example. It has an internal temperature sensor that adjusts its charge rate according to the surrounding environment. The Save A Battery Quick Charger is a compact option with a modular design that makes it easy to set up. I also added the KeyLine Mini Pro for its integrated spark protection and multi-stage charging process. Great for multiple power sources, the BatteryMinder 12117 monitors as many as four lead-acid batteries simultaneously, while proactively testing them and delivering the optimal amount of electricity to each one to keep them fully charged. Its 11-foot power cord also makes it easy to maneuver around large vehicles. Despite its high price point, the solar-powered operation of the PulseTech SP-24PSC makes it well-suited for constant outdoor use. I included the TecMate OptiMate for its automatic key-less activation and dedicated programs for direct charging and operation through a motorcycle's CAN-bus controlled 12-volt socket. The Battery Life Saver BLS-48A can extend the lifespan of a golf cart battery by up to 3 times its normal lifespan, while its auto shutoff function helps to prevent power drainage. Finally, the Cleanpower Blue is small enough to store in a travel case, while its electric pulses quickly dissolve sulfates without causing damage to a battery plate.