The watt reigns supreme, if only companies would share it with us. Every time I see “mAh” on a consumer product, I cringe.

Apple doesn’t reveal battery capacity, so we’ll have to wait for the first M4 MacBook Air teardowns for an exact figure, but the company says both sizes will last up to 18 hours on a single ...

A 13-inch MacBook Air has a battery capacity of around 50Wh ... If you know only the battery’s milliampere hours (mAh), divide that number by 1,000 to get the ampere-hours (Ah).