Rocket batteries, i have heard about this from my APC UPS service centre guys. However SMF batteries are not recommended for inverters. Always remember one thing, whether you use the batteries or not, the back up capacity of the battery detoriates every year.
So think wisely. Are you thinking of a complete discharge and charging the battery? You are not going to do it often. If you go for any battery above 100AH i dont think you are going to discharge it more than 50% of its capacity based on your needs.
I am using Exide express.. yes an automotive battery and its going good for the past 2 years. Infact the heavy duty automotive batteries have a thicker plates. My personal opinion would be to go for a normal inverter battery from Exide or Amaron or Standard furukawa.
Guys remember i have seen a lot of shops in chennai using automotive batteries for inverter, the reason being it can handle higher charge currents and secondly it is cheap when compared to other batteries.
Have you ever seen any battery company mentioning the thickness of the plates being used in the batteries???? never. I havent seen any. I request people to provide me any link which explains about it.
I dont think there is much difference between an automotive or an inverter battery, its just the name and to grab extra money from consumers. I am not considering Tubular batteries in this comparison.
Final thought, be it any battery, just go for the reputed companies and do not go for all these unheard ones