You can charge it at 1.4amps like some have stated, but I think its better for the batter if you charged it a bit less.

I charge my 1600 milliamp packs usually at about 0.8-0.9 amps. I just cycle them out, and my charger will do two at a time....so its really no problem at all.

In a pinch or if you only have one pack and you don't likel to wait, 1.4 is alright.