hello AA members!

So heres my problem

Im having some weeird battery issues. About a month ago, my battery started acting up for me
I use an intellect 9.6v 1400mah nimh nun o battery. Now usually im getting around 22 rps, and my battery can last days without me recharging it, but ive recently charged it, and ive been getting really low rps like 10-11, & the battery is losing charge really fast.

I have a feeling it might have to do with cold weather since my room is always freezing during the winter! Im not sure though because I lived in Indiana a year before this, and my battery was fine!
Im confused, I might just go ahead and buy a 7.4v lipo like I've been wanting, but though t

So I want to get out and airsoft, im fiendin for a fun game, but everything is so far away from where I live.

 Does anybody play any games by the south Phoenix/ laveen area, or close to 15 minutes away?

That would be awesome if you do because I would love to find some local games I could attend regularily!

 Thanks!