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Old 29 May 2016, 17:25   #1
Country: USA
Town: Ashburn
Make: sea eagle se9
Length: 3m +
Join Date: May 2016
Posts: 5
Car battery?

Just wondering is it ok to used car battery for my electric motors(Watersnake venom 34 lb. thrust, 30" shaft) (Got battery free from my work (2). It would save me a 100 dollar if i don't need to buy a marine battery. And other question is if i buy a battery tender plus, would this charger the battery 100 percent over nite?

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Old 30 May 2016, 03:03   #2
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 977
Hi can't open the link for charger but your battery will work however it will shorten it's life if you totally flatten it
Start batteries are designed to give large draw for short periods for an electric motor you should realy have a battery designed for that use
However as it's free you will be fine using it and see how it goes depending on your use it might last years

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Old 30 May 2016, 05:48   #3
Country: UK - England
Town: Dorset
Boat name: Seabadger
Make: Ribcraft
Length: 5m +
Engine: DF140
Join Date: May 2010
Posts: 435
Hijacking this thread somewhat should batteries fitted within closed compartments (consoles particularly) need to be vented batteries with vent hoses discharging outside of the enclosed space?

One of my batteries has a vent port, the other one doesn't.
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Old 30 May 2016, 22:28   #4
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,617
Should be vented, but it doesn't have to be forced air. In truth, any holes/vents/cracks in the upper spaces of the chamber would be the most beneficial, as the hazard is hydrogen which goes upwards.

As to the original question, a car battery will work, but you shouldn't run a starting battery below about 70% of capacity. Deep cycle batteries can be run much lower, around 40% (as I recall.)

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