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BATTERY SIZE

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BATTERY SIZE Empty BATTERY SIZE

Post by SNAPPER101 Wed Aug 28, 2019 1:08 am

Whilst on my trip to the thames meet this year, my starter battery failed. I have a 22 with a anglia engine.
Before I go and buy one , I just thought I would see if I could find out, what other members have fitted.
Reading about batteries, ie the AH rating, it sounds that the Higher the AH is , the more work the Dynamo has to do to replenish the battery. 
At present the old battery is 60 AH. 
I have never changed this battery, and has worked ok for the last 3 years since I have had the boat.
The fact that I have to buy a new battery,would a slightly High AH rating be better.
regards
Alan

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Post by F23 flittermouse Wed Aug 28, 2019 9:21 am

Hi Alan, as l see it you have multiple choices.
If the battery is purely for starting replace the battery with similar to what you have or a good quality battery for a small car ( because that's what your engine is for , eg  063, look it up) Don't buy a calcium plate battery, the normal dynamo ( or alternator) technology will not charge it properly and it will quickly fail.
Or you go for a dual purpose battery that will suit both starting and leisure assuming you have room in your bay, I'm sure someone with experience of this type will furnish further advice.

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Post by BotleyBouy Wed Aug 28, 2019 10:05 am

As above. Don't worry about over-working the dynamo. It is pushing out electricity all the time the engine is running so having a higher AH battery just means the control box will be directing the flow through to the battery for a little bit longer.

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Post by JohnR Wed Aug 28, 2019 6:01 pm

When I replaced my starter battery several years ago, the guy said 'Blimey, what's that for, a mini?' I replied 'just about.' That battery is now 8 or 9 years old.
Assuming you have a separate leisure battery I'd say just replace it with the same physical size and AH rating.

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