However, I anticipate that would likely be under not just a heavy load, but one that is sustained for an extended period of time as the 87W adapter is supplying a fair amount of charge at all times. If I had the 16" under heavy load, I also imagine it's possible that the 87W adapter wouldn't be able to supply enough power to keep the battery from being drained, though probably very slowly. I've been using an 87W adapter for several hours with my 16" and, as to be expected, it appears to work reasonably well charging the battery, though I assume a bit less swiftly than I could expect from a 96W adapter. I appreciate the OPs question about simply using existing adapters (for the potential savings of time, money, and resources), and the thoughtful responses offered by some here to help those less knowledgable consider the pros and cons of various options.
![apple macbook pro 2018 minimum wat charge apple macbook pro 2018 minimum wat charge](https://www.krichhouse.com/wp-content/uploads/2019/11/DSC_5547_resize-1024x714.jpg)
If I just did what was "recommended" I'd be spending about $400 just buying new 96W power adapters to replace all my 87W power adapters and left with five 87W power adapters I'd need to spend time and energy selling or otherwise finding a use for.
![apple macbook pro 2018 minimum wat charge apple macbook pro 2018 minimum wat charge](https://icdn.digitaltrends.com/image/digitaltrends/macbook-air-2018-review-5873.jpg)
I have multiple adapters in different locations throughout my home and work spaces at which I previously charged a 15" that I just replaced with a 16".