uniden bearcat

I am looking to purchase a Uniden SDS100 slim regular size battery and battery cover.

My scanner (model BC144xl) is very old and is having trouble picking up signal. However the weather station comes in fine. I live in genesee county. Can anyone help? btw, im sorry if this isnt the right forum, i can post in the other uniden forum.

I have tried sending feed thru several computers and am using a Ground Loop Isolator from Radio Shack. Plus I moved scanner to different rooms Still have bad hum in feed. Any suggestions? Help please. I figured if I can't resolve hum its not worth sending a feed.