Works great. It slowly prepares the battery for charging. The charging speed depends on how much of the discharged energy needs to be replenished. It also utilizes each space that needs to be filled with a small amount of stored energy, it's like filling each space with the energy of a grain in a battery. This restores the original discharge capacity of the battery. (My battery is 14V). It has a selector that allows you to choose the health and settings for your battery so that overcharging doesn't destroy the battery. Once you get the setting right, it features intelligent jet charging, where it will stop charging after a full charge and then start charging again when the charge drops a bit. Great device for the price.
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