This is not a Lithium Ion battery charger as it must not be left connected to a Lithium Ion battery after it has been fully charged. He charged a 12-volt lithium battery to 14.38V and then boosted it to 13.7V. Most experts advise that in order to achieve maximum lifespan, a lithium-ion battery must not be 100% charged and also should not be used for charging. Therefore, a 12V Li-ion charger should cut out at around 13.3V at the end of the charge time. There is a non-functional button on the charger body, which means there may be another version of this charger that is capable of operating is more suitable with lithium-ion batteries. There are several cheap lithium battery protection modules available that can be configured to stop charging at a certain level and I'm going to add one of these to my system. https://www.amazon.com/ToToT-Protection-Disconnect-Car-Electric/dp/B08NPJ36TD/ref=sr_1_4?dchild=1&keywords=12v+lithium+battery+protection+module&qid=1634119971&sr=8-4
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