It was time to retire my Westco after about 6 yrs so I decided to check out what Batteries + (no affiliation) had in the offing. Much to my surprise, they now have AGM batteries in 2 styles designed to fit the actual dimensions of our beloved Airheads. While not cheap, ($140.00 out the door) you can get a Duracell (Made in America) AGM battery that sits perfectly in the factory holder. This is for my R100RT, however I noticed that most other models were listed. You'll have to do your own research. Happy Hunting: