For about $800 you can get a Lithium Iron battery. Should last ten years. Put one in my hard to start motorcycle that would eat a battery every two years ... spins it over like a cordless drill. ( Smaller ... about $250). Typically don't need any kind of trickle charging, can last the winter no problem. Not to be confused with the Lithium battery chemistry used in phones etc. These don't blow up, they are specially designed for starting, high load, short duration. Plus ... about 60% lighter than lead acid.
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