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51504 bat‘s reply is the best option. Use a battery tender for idle periods longer than 2/3 months. Also you could always remove the fuse temporarily.
Some recommend a 1amp fuse in the radio. That way as the voltage drops during storage the current flow to the radio will increase and eventually cause the fuse to blow. That takes the load off of what’s left of the battery.
Over the winter I use the battery tender and also remove the fuse to reduce ware on the points in the clock.
Tom