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Old 09 May 2016, 08:17   #1
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Do I really need a MARINE battery?

The main battery on my Zodiac Pro Open 550 has just about given up the ghost - not sure how old it is but probably >6yrs.

It has no markings on it, and the Honda BF90A manual just states '70Ah' (no CCA noted).

It is very much a Starting battery as very little equipment on the boat to drain and usually engine running when in use.

I'm thinking >500 CCA - just from a recommendation on the excide website.

Something ~ 500CCA and 70Ah from Vetus is ~130

An equivalent 'Leisure Battery' generally comes in around 85 and a reasonable Car Battery from Halfords (OK I know there are better places) is around 75

So - any recommendations on the CCA and whether / why I really need a 'Marine' battery.
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Old 09 May 2016, 09:06   #2
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Originally Posted by totallydave View Post
The main battery on my Zodiac Pro Open 550 has just about given up the ghost - not sure how old it is but probably >6yrs.

It has no markings on it, and the Honda BF90A manual just states '70Ah' (no CCA noted).

It is very much a Starting battery as very little equipment on the boat to drain and usually engine running when in use.

I'm thinking >500 CCA - just from a recommendation on the excide website.

Something ~ 500CCA and 70Ah from Vetus is ~130

An equivalent 'Leisure Battery' generally comes in around 85 and a reasonable Car Battery from Halfords (OK I know there are better places) is around 75

So - any recommendations on the CCA and whether / why I really need a 'Marine' battery.
I've always used standard car batteries.
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Old 09 May 2016, 09:56   #3
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There's no such thing as a "marine battery".

My personal preference is to buy a starting battery or buy a deep cycle...hybrid batteries suck at both!

If it is a trailered boat, I would just use a starting battery... just be careful about sitting around, running the bilge pump and listening to music+VHF with the engine off. Starting batteries don't recover from being deeply discharged as easily.
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Old 09 May 2016, 11:36   #4
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From my understanding, "Marine" batteries may be designed to handle vibration better, with the operative word being "may".

I suspect that in many (you can probably substitute that with "most") cases, you pay a premium for the inclusion of the word "Marine" on the label (and maybe the inclusion of a MCA rating.)

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Old 09 May 2016, 14:14   #5
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I never use marine batteries either.
Either car batteries or truck batteries, and the occasional also called leisure battery but in normal use I really don't need anything special
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Old 09 May 2016, 14:15   #6
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Car batteries work ok marine batteries have thicker plates I was told but if a car battery can go off road it can take on the marine environment IMO
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Old 09 May 2016, 14:48   #7
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LFD75 Varta Professional DC Leisure Battery 75Ah (930075065) 650cca

Must admit to having this battery and is now 11 years old and still going strong.

Have purchased batteries off TAYNA http://www.tayna.co.uk/LFD75-Varta-P...065-P3636.html

and found them to be very competitive prices.
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Old 09 May 2016, 15:08   #8
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"marine" batts are different to car batts and more akin/same as leisure batts which have thicker plates (which is why they are usually quite a few kg's heavier) the thicker plates allows them to be deeper discharged without damaging the plates as much. with that said no lead acid battery likes to be discharged but one for a diff thread!

i always buy leisure batts for my boats, never had one fail without user error (light left on). i suspect a car battery would also be fine but i would pay the extra for a leisure battery.

whilst i have not researched this enough to comment concretely, i suspect the marine battery is a sticker change and a price hike on a leisure battery. there may be some mileage in them being better at handling severe pitch changes (i.e at sea) and keeping the plates covered but i have never seen anything on that.........one for a bored moment at work!
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Old 09 May 2016, 17:17   #9
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Are Marine Bats not intended for yachties with house functions?

Car bat seems to start my car OK and I'm 99% sure there is vibration in my car. It also manages to power my car electronics... But I don't usually sit with the main beams on, With the stereo blaring etc. While the engine is off.
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Old 09 May 2016, 17:23   #10
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Are Marine Bats not intended for yachties with house functions?

Car bat seems to start my car OK and I'm 99% sure there is vibration in my car. It also manages to power my car electronics... But I don't usually sit with the main beams on, With the stereo blaring etc. While the engine is off.
There's 3 types of batteries:
Starting = designed to discharge lots of amps within a few seconds, thin plates, not designed to be discharged deeply (Discharging below ~11 volts will shorten battery life substantially), high CCA for its size

Hybrid = mixed design with thin & thick plates... in my opinion, hybrid starting/deep cycle batteries suck at both!

Deep Cycle = designed to discharge a small amount of amps over a long period of time, thick plates, can recover from being deeply discharged (Do not leave them this way for long, or the plates will sulphate which will inhibit charging), low CCA for its size
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