How much battery do I need?

[asianflava]

Some of us who were here to endure the posts of a certain person will know that AGM batteries DO vent. Optima even offers a vent kit for their batteries. The key is, as Brian mentions, under normal conditions. I didn't vent mine, it is also in the same compartment as the rest of the electrical. Charging is when they will most likely vent. I usually charge with the compartment open.

Some of us also know that a vehicle's alternator will only charge a battery to 70%.