Originally Posted by Rolo42
I didn't say current had to be perfectly matched:
- That would protect the power supply, not the phone
- I don't recommend assuming there is adequate protection circuitry
- A $650 phone can very well fry to protect a 10-cent fuse
- Feeding 800mA to a phone expecting 1000mA will affect charging voltage; without having a schematic or block diagram, I cannot say precisely what that effect will be but either way, its running outside of Samsung's tolerances. The only thing I can say is that if your phone switches to USB (not AC) charging mode with your 800mA charger, you're OK since it's only drawing 500mA
On your first comment, I'll admit that I misspoke. However, if you want to continue this, we can do so in another thread or in PMs. I assure you I'm also versed in electronics and can argue with you about this all day and night. It won't get either of us anywhere, though, and it doesn't help anyone to argue about it.
There is a thread here that is talking about the subject, as well: Charging cable MUST be Samsung-branded, or doesn't matter?