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Old 09 April 2013, 04:10   #1
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Which Marine battery to purchase!!

Dearest friends,

I want to buy a marine battery for my boat a 75 amp/h one.

I am a bit confused which is the best to buy if either a liquid type or a gel type marine one. Can anyone give me some advice please?? appreciate all kinds of ideas.

Thanks in advance,

Yam 140.
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Old 09 April 2013, 04:38   #2
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'Liquid' the gel batteries can't cope with the starting loads and overheat - NuMax seem to be popular - I've never had any problems with them.
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Old 09 April 2013, 05:40   #3
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Had a few off of batterymegauk on ebay. No problems so far. Based in Gloucester.
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Old 09 April 2013, 06:11   #4
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Been in my boat now for nearly 8 years. Can't complain at that.

Varta Professional DC LFD75
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Old 09 April 2013, 11:34   #5
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Whatever you do - if you go for a liquid one - make sure it's a sealed type!
("Maintenance free" in sales speak)

OTher Q- is it just to crank the engine, or do you have a load of electronics / nav lights etc hangiong off it as well? If so a leisure battery might ba a good idea - although I ran a rib on a "standard" 60Ah battery for 4 years. I had to replace it, but it was half the price of the (discounted) leisure battery I put in recently.

If you are only starting the engine & a VHF a "standard car" battery will probably work OK, as long as you can keep it topped up.
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Old 09 April 2013, 12:00   #6
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I bought two of these and they work great as either a leisure battery, or starter battery (and it's cranking an inboard diesel with no glow plugs).

http://www.tayna.co.uk/Leisure-Battery-Powerline-110-CaravanLeisureMarine-Battery-P7714.html

No connection with Tayna other than being a satisfied customer.
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Old 09 April 2013, 15:55   #7
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My experience of gel batteries is that if you keep your boat stored in the winter (ie you don't use it), there is agood chance that the battery will "die"! It can sometimes be "shocked" back to life, but I think I prefer the normal type overall!
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Old 09 April 2013, 16:04   #8
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Typical 'leisure' batteries aren't really suitable for high load cranking, they're more of a slow discharge/re-charge type of unit, designed to run lights, water pumps, etc in caravans over a weekend away where no mains connection is available. This is why they have a generally high Ah capacity, but a low Cold Cranking Amps (CCA) rating.

A really good compromise is the Numax CXV24MF, which has enormous 900 CCA and a relatively high 86Ah in a small enough casing to fit in a red battery box:

Numax CXV24MF Heavy Duty Maintenance Free Leisure Marine Battery 86 Ah 900 CCA | eBay

I've run a few of these over the last 5 years and they've been excellent.

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Old 09 April 2013, 16:14   #9
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We always use numax, never had one go wrong yet!
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Old 09 April 2013, 16:41   #10
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Get an AGM battery and forget about it. Odyssey make a very good battery. Find out want CCA you need and work from there
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