The thing most people need to realize is that generally, most batteries are capable of getting pretty close to their rated output.
But that doesen't mean anything if your charger sucks ass. How well your batteries actually charge is up to your charger. Some of them can suck.
They can, for example, "charge" your batteries quickly, resulting in a lot of heat(heat is a rechargable batteries worst enemy), yet only attain 85% of maximum charge.
Fortunately, most are better than that, getting up to about 90 - 95%, but still..
So.. things to look for in a charger are; low heat generation, generally in the form of optional Slow and Fast charge; A trickle charge function when the batteries are full, which results in a ~99%, etc..
bah, just read RossMAN's post, get the MAHA C401FS charger and the Powerex batteries and be happy.
I can take over 400* pics with my A60 on a full charge with the Powerex 2200mAh's.
*250 - 500 actual, depending on ambient conditions/flash use.