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Old 02 July 2015, 08:58   #1
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Small starter battery???

I've bought a second hand 150 opti and I've read in the manual online it requires a 180ah starter battery.

Problem for me is my battery box is 15 x 15 inches and the smallest starter I've found is 20 inches in length.

Any suggestions please??
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Old 02 July 2015, 09:18   #2
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I'm no expert on this subject but Optima batteries are good where space is an issue.
They do "red top" dedicated start batteries and "blue top" which can used for general purpose as well as engine starting. Find out what CCA (cold cranking amps) you need as this is a more useful measure for a start battery that needs to deliver peak power for a short duration than AH (amp hours) which is the total battery capacity and a more useful measure for a leisure/house battery.
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Old 02 July 2015, 09:19   #3
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Ah rating is pretty meaningless for starter batteries, find out what the CCA or MCA requirements are.


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Old 02 July 2015, 09:55   #4
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Small starter battery???

I bought a dimensionally small 067 batt for the Searider (BF50) at the weekend. 540cca.
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Old 02 July 2015, 09:55   #5
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This is what's stated.

DO NOT USE DEEP CYCLE BATTERIES!
DTS (Digital Throttle and Shift) applications and Optimax engines must use a marine starting battery with 1000 MCA, 800 CCA, or 180 Ah. rating
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Old 02 July 2015, 10:00   #6
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So use the cranking amp rating to select your battery. CCA is measured at freezing, MCA at something like 60 degrees F. Find a battery group (external size) that fits your box, and look for a battery within that group that meets the cranking amp rating.

Either that, or get a larger battery box (assuming you have the space.)

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Old 02 July 2015, 11:00   #7
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An optima blue top bcm42 should do the trick iirc off the top of my head.


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Old 02 July 2015, 15:44   #8
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We had similar problems with our new 150hp Merc and ended up with a Bosch S6 Battery I think.

Expensive but c/w a warranty and Euro Car Parts had them in stock.

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