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  1. #1
    PWCToday Newbie
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    Is 8.5 Volts When Cranking Too Low?

    My battery voltage when idle is 12.6.

    When I hit the start button, it drops to 8.5 volts. I am getting a limp home mode and it won't crank.

    Before I go spend $100 on a battery, does it sound like that's the cause?

  2. #2
    PWCToday.com Is My Home Away From Home don37725's Avatar
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    Re: Is 8.5 Volts When Cranking Too Low?

    It could be battery but could also be something in circuit drawing too much juice - Take battery to Advanced or the Zone and have them do a draw test

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  3. #3
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    Re: Is 8.5 Volts When Cranking Too Low?

    It shouldn't fall below 10.5
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  4. #4
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    Re: Is 8.5 Volts When Cranking Too Low?

    What year, make and model are we talking about here?

    If there's an instant drop in voltage. Either the battery cell(s) are too weak to support the load or a component(s) is causing the voltage drop(possible failing component).

    Download the manual in the "Sticky" section at the top of this topic for free for your make & model and have the battery load tested at an auto parts store to know the condition of the battery.

    Also please post back as to help other folks possibly having this type of issue.


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  5. #5
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    Re: Is 8.5 Volts When Cranking Too Low?

    Thanks everyone!

    I bought a new battery and it started right up. The jet ski is only a year old and was on a genius charger all winter. Is there a better way to prevent the battery from going bad?

  6. #6
    PWCToday.com Is My Home Away From Home don37725's Avatar
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    Re: Is 8.5 Volts When Cranking Too Low?

    Quote Originally Posted by meowman View Post
    Thanks everyone!

    I bought a new battery and it started right up. The jet ski is only a year old and was on a genius charger all winter. Is there a better way to prevent the battery from going bad?
    Yes - buy an agm or gel battery - Common for the wet acid types to only last a year or so.

    ***
    Democracy is two wolves and a lamb deciding what to have for dinner***
    *******************Liberty is a well-armed lamb.*****************

    **********Lotteries are created by those who understand math**********
    ***************to take advantage of those who do not****************

    ***************As government expands, liberty contracts**************

  7. #7
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    Re: Is 8.5 Volts When Cranking Too Low?

    Quote Originally Posted by don37725 View Post
    Yes - buy an agm or gel battery - Common for the wet acid types to only last a year or so.
    Lucky for me, I purchased an AGM. Thanks!
    Last edited by meowman; 05-16-2017 at 12:15 AM.

  8. #8
    resident guru hafweigthr's Avatar
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    Re: Is 8.5 Volts When Cranking Too Low?

    Keeping a battery (acid cell ) on any charger(tender) over the off season will kill most any battery unless you buy a really expensive tender. Best to charge at the end of the season, and then once per month. Never charge a battery on the high amp setting unless you need it right away.

    If you buy a AGM make sure it has a current date. Most of the batteries I have found this time of year (Autozone, Wal-Mart, Advance, O-Reilleys) are on the shelf from last year. Look for a XX/17 date. Buying year old batteries even though they may take a charge is a crap shoot. Most are down to less than 12V and once undercharged for soo long it can affect battery life.

    If you are buying a battery and leaving in the ski all winter no matter what kind you buy---you are wasting your money because chances are it won't last .

    A good battery should read at least 12.5-12.6 volts 24 hours after coming off a full charge.
    Last edited by hafweigthr; 05-17-2017 at 01:10 PM.
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  9. #9
    PWCToday.com Is My Home Away From Home Chester's Avatar
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    Re: Is 8.5 Volts When Cranking Too Low?

    Quote Originally Posted by don37725 View Post
    Yes - buy an agm or gel battery - Common for the wet acid types to only last a year or so.

    Yuasa lead acid batteries will last 3 - 5 years. Most others are junk.

    This is a good charger to use during storage. http://www.canadiantire.ca/en/pdp/ba...1940p.html#srp

    Chester
    Last edited by Chester; 05-17-2017 at 02:41 PM.
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  10. #10
    resident guru hafweigthr's Avatar
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    Re: Is 8.5 Volts When Cranking Too Low?

    Quote Originally Posted by Chester View Post
    Yuasa lead acid batteries will last 3 - 5 years. Most others are junk.

    This is a good charger to use during storage. http://www.canadiantire.ca/en/pdp/ba...1940p.html#srp

    Chester
    Chester --- I will agree with you on that, I think the thing is they are inconsistent - I have some AGMs that are the same and bought at the same time etc. one last 5 years the other maybe a year. I know most on here speak highly of Odessey batteries and I have heard that Batteries Plus also makes a good consistent battery.
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