Mmmh, my e-cigs manual says otherwise....., but okay
(do NOT use more than 1A!)
I can assure you that's not how Ohm's Law works. In fact, since though retired my Credential to teach this good stuff is 'Lifetime' if you were in California I could charge you for the education. Believe what you want, but either the manual is wrong or you're misreading it.
The routine for charging Li-ion cells like we use (and laptops, cell phones, etc) it called "CC/CV" (Constant Current, Constant Voltage). The charge rate (current) IS SET BY THE CHARGE CONTROLLER, NOT THE SOURCE. It's a constant current, usually an Amp or so maximum, determined by a resistor value from one pin to ground of the IC (standard parts, everyone uses them). Pens, for instance, might be 300mA using the same controller with a different resistor value. It charges at that rate (with voltage climbing) until the voltage approaches 4.20 Volts when it shifts out of 'CC' mode and into 'Constant Voltage' where it cuts back the charging current UNTIL IT REACHES 10% of the CC value where it terminates charge. So it has to know the original charging current to know when it's dropped to 10%? As long as the source has potential capacity to support the full current.....if not it all just slows down (less recharge current).
https://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
Good graphs there (and lots of other places) if you're good at reading 'em.
Again, please consider the can opener in your kitchen (which needs a fraction of an Amp typically) doesn't blow up when you plug it into the socket the toaster oven (needing fifteen Amps) just came out of. Same deal here.
That's the way real electricity works. A boss I had early on used to say, "Never argue with electrons,
they know what they're doing". I'm set up to monitor this current change, I watch it 'most every day'.
It's sort of like floating your boat. The water has to be deep enough so you can sink deep enough to displace water weighing as much as you and the boat or you're 'grounded' and don't move very fast. But after that it doesn't matter how deep the water is, inches count same as miles, unless you need to 'draw more water' (deeper draft boat)?
Again feel free to believe and do what you believe, but you are mistaken somehow in this idea. Even if you 'read it on the web'. And I wouldn't discount ignorance or translation problems? It just ain't so.
Regards to all.
OF