Sadly, nothing lasts forever, so it's a good idea to know how to check your MacBook's battery health. Without a doubt, the power pack is one of the most important pieces of hardware in your Mac, as with no working battery you'll be confined to wherever your cord can reach, which can be a bit of a pest if you're not at home or in the office.
Although the best MacBooks have been designed to last many years with regular use, the one thing you might need to replace at some stage is the internal battery. Unfortunately, batteries in Apple's MacBook series will only last a certain number of cycles and then you'll likely notice a substantial drop in performance.
