Tracker service

It sounds like a rip off/scam to me.

Its a scam! The back-up battery in the Stinger Alarm has a recommendation to change every three years you can buy from Sargant I`ve seen a figure of around £40 quoted and that's expensive. Only requires removal of cover and change battery. 

The Stinger alarm is not a tracker and the OP is specifically talking about the battery in the tracker. I’m not sure if the OP means the Sargent Tracker or one of the other commercially available trackers.

The Sargent does have a rechargeable battery the Tracker apparently does not

Yeah it does mate,  they both do, on the coms unit (that's the tracker) its a group of five bateries which also takes a charge off the van battery to keep em fully charged, and the stinger has three pretty well the same set up, I can go on line and check the van battery also the stinger to make sure it hasn't triggered, and if I had left the main command switch in the on position I can see what the solar panel is putting into the van battery all from my lounge, its a good system if it works well..

I thought it had a rechargeable battery also but looking on the Tracker website I must have been looking at their retrieve which does not according to their blurb but that might not be the full story either. I know some caravan manufacturers were using the retrieve

Mine is the Swift command system, its all built and installed by Sargent electrical had a small problem with mine when I picked the van up which I didn't even know about, chap from sergeants told me on the phone theres a small problem with your coms unit it needed one with a stronger sim card cos where I store the signal is week, they offered to send one to me to install myself or take it back to the dealer,I did it myself, easy peasy...

I had a similar problem with the Sargent Tracker built into my 2018 Challenger from new. It worked fine for almost 2 years then started to have problems communicating. I was originally sent a like-for-like replacement by Sargent which had the same problem. They then sent me a unit with an separate aerial which improves the cell phone reception. I was told that the Sargent Tracker uses the 2G network to communicate and reception is becoming less reliable as the network providers phase out the 2G system. The Sargent Tracker obviously needs to be updated to use newer cell phone technology or more and more users are going to experience this issue.

I`m well aware of that but the tracker is interconnected with the alarm system which alerts the tracking company if the van is entered or tilted.

I've said it before, but I'm glad Sargent don't make car alarms. The alarm of my 2013 caravan went back for a repair shortly after we bought it about 3 yrs ago. The repair it apparently had was do with the sounder I repaired again the other week. I've had 15yr old cars with fully working factory alarms.