You have two problems. First, your "wall wart" is only charging at a rate of 50-60ma, so it will fully charge a 600 pack in about 10-12hrs. Your 2700 pack will take well over 30 hrs to charge at that rate.

It's also possible that the charge current will be too low to ever fully charge the pack, no matter how long you leave it on there. I'm not sure what value that is, but I think you are getting close.

The other problem is that Nimh cells don't like being overcharged, and at the normal "slow" nicad rate of c/10, they will over heat if you over charge them.

That said, charge current is charge current when it comes to Nicad and Nimh, so you won't hurt the pack if you don't over charge it, I just don't think you'll get a full charge, since you'll have to wait forever..