If you want to know how to charge a LifePO4 battery, you’ve come to the right place. This guide will help you charge your LifePO4 battery fully and get the best out of it. If you’re not sure how to start charging your battery, check the battery voltage chart before starting. Ensure that your battery has at least 3.4 Volts when it’s empty. You will need to fully charge it before you can use it.