He wasn't "mansplaining," which is when a man condescendingly explains something a woman already knows because it's not that hard to comprehend. He's *explaining* that this method is wrong because it will eat up more power than it gives because of...engineering/science.
If you try this and it seems to work, it's only because there was charge left in your battery that you are actually draining at a faster rate.
I get what he's saying, but the op wasn't coming up with a permanent alternative to a portable charger, just an emergency use for people stranded without electricity after the hurricanes and need to call for help
If you understand his explanation, it means that you may have been using a phone connected to a 9V battery, but essentially your phone's battery was losing power to it, and it wasn't adding to your phone's charge level.
Hers has Hollywood..
SMH
If you try this and it seems to work, it's only because there was charge left in your battery that you are actually draining at a faster rate.
It's like opening a bottle under seawater for drinking..