Charging MacBook Pro

OK thanks -- a picture is worth a thousand words.

And I'm back to my original answer -- you can use either of those with your Mac (or any other Apple device). The markings in the photos only indicate the maximum power that they can safely handle (and that is significantly larger than anything Apple currently has that will connect to those) and have nothing to do with how much power is supplied to your Mac. Apple doesn't have any power adapter for any device that draws more power that either of those are rated for.

What matters is the power adapter that you attach to them. If your MacBook Pro came with a 61 watt power adapter, you can use that 61 watt power adapter either in the U.S. or the E.U. or any other country in the world. If your MacBook Pro came with a 87 watt power adapter, you can use that 61 watt power adapter either in the U.S. or the E.U. or any other country in the world, etc.

It won't damage the battery. The MacBook Pro is designed for use in the U.S. and E.U. and other areas of the world and is supplied by Apple to various countries with the same battery and power management everywhere.

I'm sorry -- I completely missed the fact that you were asking about two different power adapters. I jumped to the conclusion that you were asking about plug adapters.

And yes, you are correct -- using a smaller wattage power adapter is not something you should do.

I'm also confused about what power adapters you are asking about. 7 amps at 120 volts (the U.S.) is 840 watts and 2.5 amps at 240 volts is 600 watts and Apple doesn't have anything close to either of those.

Yes.