howlong 4 residual battery drain 2 drain a battery

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36,523
Location
ME
A car battery is about 80 amp-hours. 416 days. Normal chemical reaction will kill the battery faster than this load.
 
Messages
720
Location
Delaware
You won't get 416 days because the memory presets may be lost once the battery drops below 9.5 volts. That's the limit for most cars, and your electronics probably aren't different as far as operation, just the packaging to resist a marine environment. I vote also +1 on the battery tender. Remember, a starting battery for a car is designed to give big amperage for a short period; not a steady drain for a long time.
 
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