My E6410 needs a new battery. I've been looking at replacements on Amazon, and am unsure about the right one to pick.

Specifically, there's one listed as 5200mAh, but says its voltage is "10.8V (Compatible with 11.1)", rather than 11.1V. Is this actually a lower capacity battery than normal? Does this lower voltage matter?

In practice, does it make much difference going for a 5200 as opposed to a 5000?

Any general advice about which one to choose would be much appreciated!