If you’re wondering how fast you can charge a LifePO4 battery, you’re not alone. Thousands of people wonder this same question. Here’s a guide to help you learn how fast you can charge a LifePO4 battery. Unlike lithium batteries, which have a steep curve from zero to about 99% capacity, lithium batteries have flat curves between 80-90%. These batteries are easy to charge, but you will need to wait for 15 minutes before you compare your measurements with the curves of the battery’s current state.