I bought my deep cycle battery off of a fairly wealthy Boater, who replaces his batteries every two years. $20 each is what he wanted,the battery is still in top condition, was at 13.7 volts when i picked it up. He replaces the battery bank every 2 years to keep everything problem free.
Maybe consider doing the same, if you can find a source.
$20 or so vs $100+ makes it a affordable upgrade.
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Ride a Mtn bike for errands exercise entertainment and outright fun
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