Lithium batteries require a specifically rated charger due to how lithium cells take a charge. Specifically, lithium batteries need to have the last 5% or so of the charge process to be extremely limited and regulated, as a lithium cell does not take well to overcharging. Lithium cells are also much more finicky when it comes to their charge voltage range, which has a much narrower window than a typical lead acid battery. This is the same reason that there are specific regulator/rectifiers that need to be run when using a lithium battery on a bike.
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