Differing Battery types - Understanding your type of battery

[Nelly]

After doing a few replies to posts regarding sealed lead acid (SLA) batteries, I decided to look into what the differing types are.
I found this website which explains the difference between Absorbed Glass Mat (AGM) and Gel Batteries.

http://www.atbatt.com/sealed-lead-acid-batteries/faq

Basically most alarm standby batteries are AGM batteries, not gel, and as mentioned before, as long as they are not discharged beyond 60% of their capacity they should last a long time.
There's some good info, including what a swollen Battery indicates (overcharging).