Most batteries installed today are lead-acid batteries—either flooded or sealed. Flooded batteries are used extensively in off-grid situations, when frequent cycling is part of a battery’s duty and maintenance is a given. To get maximum life from this type of battery, it’s important to monitor electrolyte levels and state of charge, and run regular equalization charges.
Batteries in grid-tied systems will rarely cycle and require far less maintenance, so sealed lead-acid batteries can be a good fit. Compared to their flooded counterparts, there’s also very little gassing, yet batteries should still be contained, kept out of living spaces, and have sufficient ventilation. Sealed batteries are more expensive, must not be overcharged, and have a shorter life expectancy, but their low maintenance and ability to handle the small number of cycles they will see in service still makes them an appropriate choice.