Not the greatest quality battery and not the greatest charger either.
I'm not offering any opinions at this time but I suggest you use this websites search function and dig up some information on shootsoft before you decide to make a purchase.
However if youre dead set on those items you can get pretty much the exact same ones from airsoftparts.ca for less.
The only reason I say that the charger isnt the greatest is because there is no display and no charging settings. I personally prefer to be able to set the charge rate that my batteries charge at.
Although I believe the battery you require for the AK you listed would need to be something like this.
Im not an AK owner or user so someone please correct me if I am wrong.