Mr. Xulfiqar is right...
Actually the real DRY batteries are filled with gel... and used for deep discharge rather then for cranking...
MAINTENANCE FREE bateries are widely known as dry batteries which is not right...
My opinion get local AGS battery, fill with proper electrolyte,
check ur charging system (no over or under charging),
check electrolyte level periodically and refill only with distilled water,
keep battery top and terminals clean and free of verdigreas (wash with baking soda mixed in water),
check that terminals are tightened properly and cover with petroleum jelly or grease...
I m sure ur battery will last for more then u will expect...