https://wccftech.com/arm-based-2020-12-inch-macbook-battery-leaked/

There has been plenty of talk about Apple resurrecting the 12-inch MacBook and incorporating it with its own custom chip for a release in late 2020. Apparently, that release might happen sooner than later because regulatory filings have revealed the battery capacity of an unnamed portable Mac. However, one tipster believes this battery is for the ARM-based 12-inch MacBook so let us talk about this in more detail.

The rated capacity value mentioned is 4380mAh, meaning that the upcoming ARM-based 2020 12-inch MacBook is expected to feature a 49.9WHr cell. The interesting thing about this little detail is that the aforementioned capacity is the same one found in the current-generation MacBook Air, so it’s not confirmed if this is going to be for an updated MacBook Air or the ARM-based 12-inch MacBook.