The lifespan of a MacBook battery service can vary depending on multiple factors such as usage patterns, battery age, and operating system settings. Typically, a MacBook battery can last anywhere from 1,000 to 1,500 charge cycles. However, this number heavily depends on how well the battery is maintained and the frequency of use. It is recommended to have a professional check the battery health every 12 to 18 months to ensure optimal performance and longevity. Some common signs that indicate a battery service might be necessary include decreased battery life, slow performance, and a bloated battery. Keeping the MacBook away from extreme temperatures and using the power adapter only when necessary can help prolong the battery lifespan. Overall, it is important to prioritize battery maintenance to ensure that the MacBook's performance remains consistent and reliable.