The recalibration feature addresses an issue that some users were experiencing with inaccurate battery health report estimates. Symptoms of this issue include unexpected battery drain behavior and, in rare cases, reduced peak performance capacity. Such inaccurate battery health reports do not reflect actual battery health issues. After the recalibration is complete, the maximum capacity percentage and peak performance capacity will be updated. The recalibration message will also be removed, indicating that the process is complete.
If a recalibration of the battery health report indicates that your battery health has declined significantly, a battery repair message will appear. In rare cases, the recalibration may be unsuccessful and a new battery repair message will appear. If this happens, to fully restore the battery’s performance and capacity, go to an Apple Authorized Service Provider for a free battery replacement. Such situations do not represent a security issue. Your battery can continue to be used.