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battery question 

 

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 Post subject: battery question
Posted: Mon Jan 01, 2007 11:17 pm 
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ive got a jetski and due to the drought its been sitting in the shed for a fair while and the batteries gone belly up.

im thinking of putting another one in to get it going as i might get some time at the beach with it. if i put another battery in how long do they last if i let it sit for another few years?

 

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Posted: Mon Jan 01, 2007 11:46 pm 
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Without use all batteries die. They slowly lose charge and once below 11V they start to calcify. Actually it is not calcification but some other chemical reaction that coats the plates so that they either short out or no longer react with the electrolyte.

Best is to either run every other week for 10mins or so or remove and store in a cool dry place and connect to a battery charger once a month.

cheers
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Posted: Tue Jan 02, 2007 1:02 am 
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MacGyver wrote:
Without use all batteries die. They slowly lose charge and once below 11V they start to calcify. Actually it is not calcification but some other chemical reaction that coats the plates so that they either short out or no longer react with the electrolyte.
Sulphation kills lead acid batteries - lead sulphate forms on the + and - plates as the battery discharges - if left, this hardens and the charging process will not reverse it.
So the battery needs to be at the fully charged state as much as possible.
Jaycar sell photocells that use sunlight to trickle charge - cost around $30-$40 from memory.

 

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Posted: Tue Jan 02, 2007 9:22 am 
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Would`nt a jetski, by it`s nature, have a deep cycle marine type battery...? I`m thinking you only bring `em out in the good weather so it might sit for long periods without being charged/discharged...

JAIKAI
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Posted: Tue Jan 02, 2007 10:47 am 
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but i think last time thats what happened. but you are right.

if they calcify a little bit, will running the battery and charging it bring it back to good

 

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Posted: Tue Jan 02, 2007 11:10 am 
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jaikai wrote:
Would`nt a jetski, by it`s nature, have a deep cycle marine type battery...? I`m thinking you only bring `em out in the good weather so it might sit for long periods without being charged/discharged...
JAIKAI
They last longer than std car batteries, but they still need maintaining/charging just like every other lead acid battery. In doing this you increase it's effective life even more so.

fiftyone wrote:
if they calcify a little bit, will running the battery and charging it bring it back to good
Depends how long it's been sitting in this state. Best to regularly charge it as mentioned, or maybe a trickle charge like the solar cell thing. If you get a hydrometer, and can get to the electrolyte (some are gel type), measuring electrolyte specific gravity is the best way - or load test it using a headlight, etc, can give you a good idea of the capacity remaining.
Here's a bit of reading: http://www.uuhome.de/william.darden/index.htm .

 

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Posted: Tue Jan 02, 2007 7:20 pm 
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Most batterys used in jetskis are not much more than a motorbike lead acid type. You can get hold of an AGM batterys 22a/h for the same price similar size as original but not the same (will fit though) if you look around and if you charge them properly will last for quiet a while. Done this myself to date no dramas and they are fully sealed so no mess either.
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