The more electrolyte and electrode material in the cell, the greater the capacity of the cell.
A battery is a device in which chemical energy is directly converted to electrical energy.
The capacity and life expectancy of a lead acid battery will vary depending on the temperatures that it operates in.
Often the lifespan you can expect to get out of your battery is referred to in terms of “cycles”.
How long a battery will last depends hugely upon the way it is used and how well the battery is maintained.