My boat came with 4 of their 27TMs. I did a search and read claims that their batteries are actually made by US Battery, which should be good news as I've read in threads on Sailnet that they make some of the best deep cycles.
Batteries - Golf Cart - Marine - Deep Cycle - Motorcycle - RV - Powerstride
They seem to be a chain of dealers in California.
Mine are now 3 years old and I'm wondering if I can hope for another 3 years.