All Lithium batteries for Ebikes will loose capacity over time. As the cells deplete, typically 1 to 2 years, you will find your daily range drops. Eventually the battery will become unusable. A common cause of Ebike breakdowns are actually a battery voltage running too low and disconnecting the power to the Ebike. It's very hard to know how many Amp Hours your battery has left during it's lifetime. The only definitive way is to load test the battery after a full charge. Our battery tester is a perfect way to give your ebike battery a health check. It will print out a report of the total capacity of the battery, the health of the cells and the discharge curve.