Same one I am running for two years now.
The first one conked out on me after sitting too long disconnected in a modestly cold garage. I put a tender on it and it came to life, but never was the same ever again.
I was then told by Braile techs that it should sit no longer than 3 months and then put a Braile tender on it to keep it topped off. They also said that usually when disconnected, they will hold for longer, but still good to top off and keep fresh.
I used to have a US Post office truck battery in its place that weighed close to 65 Lbs.