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Two options.
Option one as previously stated, take the battery out...
Option two. This is kinda of heavy handed. Put a second battery in the car, either in the trunk or in the engine compartment, and use a set of jumper cables to put the second battery in parallel with the primary battery.
The two batteries, once connected will equalize among themselves and add almost double (or more) the capacity (depending on the second battery size). Once a month, take the second battery out, charge it and put it back in.
Jumper cables is my first thought, but the cables you use do not have to be very heavy. They only have to carry a small amount of current.
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