Question about Recharging

[fananntut]

I know that this won't be a stupid question, cos I'm asking but I still feel a bit stupid asking this as I work in IT . Here goes!

Does it make a difference what you plug the USB charging adapter into? For example, I read on here recently that you shouldn't use a laptop USB to recharge your batteries, could someone tell me why? If I'm using a plug adapter to connect the USB charging adapter, should the voltage and amps match what's on the USB charging adapter?

I'm having a few problems at the moment, and don't want to bother the vendor in case I'm doing something numpty and someone else can learn from it .

[2risky]

There is a theoretical risk that a short circuit in the charging apparatus might damage your motherboard, but it's not a biggie to be honest.

The charger itself should regulate the current it uses, so if the source (eg a 2000mA mains plug USB adaptor) is overpowered, the charger will draw only what it needs, say 500mA for trickle charging a battery. It's more of a problem if the source is underpowered, but that just results in slower charging normally.

However, the voltages of the charger and source should match. For USB that's 5V.

Edit: If any of that isn't clear, I can sometimes manage Engish too, just ask if confused.