Question: how long does it take for a lithium ion battery to charge?
Answer: Usually, only stages 2 and 3 are used, and a full charge can take from 2 to 4 hours depending on the charge rate. Li-ion does not need to be fully charged, as is the case with lead acid, nor is it desirable to do so. In fact, it is better not to fully charge, because high voltages stresses the battery.