Hi, I have the NS50 from NiteSite which i love. I go along with Secretagentmole about the battery, but i went down the road of buying a replacement (lightweight) battery off of E-Bay for about £20. I now use both batteries, i take both with me shooting. I use the heavyweight one when i am shooting from a static position (my shoot allows me some shooting from my car), then i use the lightweight one when walking.
The other thing i have done because i found holding the gun/nite site a very strange position (combo of my bad back and bad eye sight), is to copy Si Pittaway and get a piece of allumi