Hi guys, I've only been using my FreeStyle Lite meter since Nov 21, 2017 and it was brand new. I think I need to buy a new battery already because I've noticed the little battery image appear sometimes when I'm taking a reading. Is it normal to have to replace the battery after less than 2 months? I know I test a lot but I thought the battery would last longer. And do I just buy a battery at Walmart? I'll go get one tomorrow so I have it on hand when this one kicks the bucket.