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How many volts does it take to charge a 3.7 volt battery?

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Capacity, voltage and lithium LiFePO4 chargers

A 12v lithium LiFePO4 battery fully charged to 100% will hold voltage around 13.3-13.4v. Its lead acid cousin will be approx 12.6-12.7v. A lithium battery at 20% capacity will hold voltage around 13V, its lead acid cousin will be approx 11.8v at the same capacity.Nov 29, 2017');})();(function(){window.jsl.dh('18','');})();(function(){window.jsl.dh('_CD6hYPWGI8jq-gSZ3ZLYCw45','
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Therefore, to achieve a 12V battery you'll typically have four cells connected in a series. This will make the nominal voltage of a LiFePO4 12.8V.

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