Plenty of us on here have had same problem, the internal battery only lasts for about 10 years and it is not replaceable. You can rip the alarm out, replace it with an expensive new one or it is possible to bridge the connectors to bypass it.If you search on here for Meta alarm there are a few threads and I think one showed you how to bypass it, which is what i did when I had mine, two bits of wire are all that is needed but cannot remember how to do it as it was over 5 years ago.
I had my Gen1 for 6 years and the alarm foccing up was the only time it broke down.
Just found this thread which showed me how to do it http://foc-u.co.uk/index.php/topic,4493....l#msg38000
I had my Gen1 for 6 years and the alarm foccing up was the only time it broke down.
Just found this thread which showed me how to do it http://foc-u.co.uk/index.php/topic,4493....l#msg38000