Hey guys! This is a complete noob question, so I figured it belongs here. So I have a Tesla Two Sub Mod, and it says on the charger port is charges at 1amp. My question here, is if I use a phone outlet that is a bit over 1 amp, is this dangerous? Or does the mod itself know to charge at the correct pace?
The charger is in the mod and it controls how many amps it gives the battery. The USB port, be it in a computer, a wall wart, or something else is simply a power supply that outputs a voltage close to 5V and is rated for a maximum amperage draw. Your charger in the mod will not take more amps from the USB port than it wants to no matter how many amps the USB port is rated at.
I have a mod with a built in battery and a built in quick charger that connects via USB cable. It draws a bit over 2A in its first charging stage. The first time I charged it I used a 1A wall wart (I was impatient and didn't want to wait until my higher amp rated wall wart got to me) and the wall wart heated up to a point I was uncomfortable with after about 20 minutes. I stopped the charge until it cooled down and reconnected it. I did that twice to get it charged and never used a 1A wall wart with it again.
I got
one of these 2 port USB adapters rated for 2.4A per port and heat generated became acceptable to me ... just slightly warm during the high amp initial charge stage.
I also bought
one of these USB voltage/current testers to let me see what amps and voltage the USB port was actually putting out. Neat gadget for $10

. Here's
a review of it on lygte-info.de. It also tells you how many total mAh were put in the battery which is also useful.
I don't charge many things with a USB power supply, but since I got the Ravpower it's become my go-to wall wart for all of them. Chargers that only draw 0.5A charge just fine at 0.5A and I'm not stressing this 2.4A beast in the least.