I have a couple of these. No problems, no regrets.
http://www.rc-mushroom.com/product_i...p-pack-p-18241

Depending on your application the fit may be a bit snugger than a nimh pack. I had no issues in my Tamiya MK2 car but had to shave off the top edge on my receiver box of my Kyosho 777 to fit properly.

I also use the flat pack versions in 1/10. No more nimh for me