FusoFG said:
agm
they can be sent ups, don't gas and don't require special charging voltages
optima yellow top
Only
Valve Regulated AGM batteries can be mounted inside. The Optima Group 31 yellow top is
not valve regulated. Lifeline and Deka offer this feature on theirs.
In you decide to use an Optima 31 yellow, there is a vent tube in the center of the battery where the side meets the top that is for connecting a vent tube that you can route to the outside. Note that this is only on their 31.
The main differences between Gel & AGM besides the higher price of gel is that the gel will cycle more. From a performance side, the AGM will work better at lower temperatures than the gel.
If you would like more info on AGM, Deka or Lifeline, PM me.