791vx range is horrible, bad car battery?

Today, I noticed that the range on my 791 is just absolute crap. I was about 10 feet from my car and it wouldn't lock. I moved closer and closer, and hit the button, and it finally locked when I was right at the drivers side door. My remote's battery level showed 3 out of 4 bars, and I didn't think much of it because I've gone down to 1 bar and still had good range. But, I did replace it with a fresh battery anyways, and the range still blows. I've had a suspicion for awhile that my car battery is on its way out. It's the stock battery, a bit more than 3 years old, it's been through some pretty tough winters (especially this winter when I was doing freezing cold starts several times a day) and I've noticed lately, it's been a bit more hesitant to start, I have to hold the key for a bit longer. Could the battery be dead enough that it's not able to provide enough juice for the alarm, but barely enough to start the car? Thanks

Try unplugging and replugging in your antenna to re-sync the remote to the alarm. The DEI systems monitor voltage during start, and if the battery in the vehicle is weak normally the remote start will not operate, it will start to engage and then just stop. If your vehicle is remote starting I would have to think your problem is with the alarm and remote not being properly synchronized not the vehicle's battery. Another thing I would try is re-grounding the system. If the system has a poor ground, or one that has gotten worse over time it will also cause range issues.Installer, IT support, and FFL. I need less hobbies.

RF interference: Nope, none that I know of. This has happened in several different areas, it's not just isolated to my house or anything. Ground: Wouldn't know where to look. I suppose I could take it back to the shop that installed it, it's got a lifetime warranty Keyfob battery: Brand new Car battery: Just installed a brand new Red Top today. I was hoping it would fix this problem, but I need a new one anyways. I was directly behind the car, trying to pop the trunk today, and it just wouldn't do it. I moved towards the front of the car (the antenna's on the windshield) and it popped right open. Anyone have any suggestions before I call the place that installed it? Thanks

Since your system was professionally installed, I would take it back to the shop that installed it and explain your concerns to them. Most shops will void their warranty if the customer messes with the installation afterwards. Range from the rear of the vehicle will be less than that of the front, especially if you have window tint, however it should be much better than what you are describing.Installer, IT support, and FFL. I need less hobbies.