At 2.4A, you'd be around 5 hours and so forth. Theoretically, the 15" Macbook's 7.2Ah battery would charge in 4 hours assuming 60% efficiency, that the charger actually puts out a full 3 amps, and there is no usage during that time. There’s a reason Apple gives you a plain 30W charger with the least expensive MacBook Air model, though at starting price of 1,199 we think Apple should have just given all MacBook. It takes hours but you'll have a full charge in the morning. I've even recharged overnight with a 3A phone charger when I didn't have anything better. I've now charged on low-power chargers countless times. 8GB unified memory Configurable to 16GB Storage 2. Two Thunderbolt / USB 4 ports with support for: Charging DisplayPort Thunderbolt 3 (up to 40Gb/s) USB 4 (up to 40Gb/s) USB 3.1 Gen 2 (up to 10Gb/s) 3.5 mm headphone jack Memory. *Fun fact, you don't actually need to unplug the 60W adapter in this case, the computer will draw from the higher wattage adapter, and stop drawing from the lower. Built-in 49.9watthour lithiumpolymer battery 30W USB-C Power Adapter Charging and Expansion. In that case I need to calm things down or plug in the 87W adapter.*Īnything with a USB-PD charger should be able to charge the battery, even the 30W model, though in that case your MacBook Pro may need to be asleep to charge.
Typically lack of wattage isn't noticeable, but on a few occasions, while running the MacBook Pro hard, I have noticed the battery is not charging, or even draining. At home, I have an Anker USB-PD 60W adapter.
It came with an 87W adapter, which I usually leave at work. Yes, it will charge from a lower-wattage adapter so long as the computer is not burning the energy faster than the charger is providing it.
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