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  1. #1
    hkss's Avatar
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    Seadoo Batterie - vent outlet

    I dont understand the function from the vent outlet because:
    I open from time to time the Batterie caps from the batterie cells.
    At every cell I opened, I can heare a negative pressure or a overpressure -
    little air sucks in or press out.
    Is every cell encapsulated? It seems so for me.
    But what is the vent outlet function?
    Only for extrem overpressure?

    I have no problem at all the last 30hours - but I want to understand this.

    Click image for larger version. 

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  2. #2
    Sanfish's Avatar
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    When a battery is charged and discharged, water contained in the electrolyte is decomposed, generating hydrogen and oxygen gases. These gases are vented out of the battery through the exhaust vent tube to prevent potentially damaging high pressure gas accumulation. The gasses are corrosive. If the battery sucks in when releasing fill caps, its due to differential temp between cells and exterior.

    When it comes time for me to replace my OEM battery, I will be buying the Deka ETX30LA. It is an AGM type battery!
    Last edited by K447; 02-02-2015 at 02:07 PM. Reason: battery model typo

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Sanfish View Post
    ... When it comes time for me to replace my OEM battery, I will be buying the Deka EXT30LA. It is an AGM type battery!
    This is the correct answer. Old-school liquid lead-acid batteries are ancient technology. Modern factory sealed AGM batteries are a much better all around battery for watercraft. Zero acid exposure outside the case, will not leak even if punctured. Very robust AGM design withstands vibration and impact. There is no vent nipple as AGM batteries do not vent except in very extreme situations.

    I think the vent nipple in a traditional lead-acid powersports battery is not a completely open channel into each battery cell. Each cell has a pressure control valve between that cell and the common vent channel leading to the nipple. Only when there is a strong enough pressure differential does the cell vent flow pressure to/from the vent channel and the vent nipple.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by hkss View Post
    ... I open from time to time the Battery caps from the battery cells.
    ...
    I have no problem at all the last 30hours - but I want to understand this...
    Why are you opening the caps on the battery cells at all?

    Normally a battery should not need to be opened unless there is a significant loss of liquid level inside the battery cells. A small change in liquid level is normal over time and does not need to be corrected.

  5. #5
    hkss's Avatar
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    Quote Originally Posted by K447 View Post
    I think the vent nipple in a traditional lead-acid powersports battery is not a completely open channel into each battery cell. Each cell has a pressure control valve between that cell and the common vent channel leading to the nipple. Only when there is a strong enough pressure differential does the cell vent flow pressure to/from the vent channel and the vent nipple.
    That sound logic.

    I open first time at no reason - second time (some weeks later) to make the level in each cell equal - third time (some days later) before charging the batterie for to winter. Everytime I noticed this altitude compensation when I open the caps. Ok, at boring wintetime I make some needless things

    And yes, I want buy a AGM or Lithium batterie, but first I want to see or hear from somebody witch model fits 100% correct in the support from my seadoo RXT-Xas and second I hesitate because I hear that high temperatures in our enginge compartments are very deleterious for AGM and Lithium batteries
    (Seadoo must have a reason to take this old shool batteries).
    But this I mus verify later at some time...

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by hkss View Post
    ... I want buy a AGM or Lithium batterie, but first I want to see or hear from somebody witch model fits 100% correct in the support from my seadoo RXT-Xas and second I hesitate because I hear that high temperatures in our engine compartments are very deleterious for AGM and Lithium batteries
    (Seadoo must have a reason to take this old school batteries).

    But this I must verify later at some time...
    AGM and Lithium are very different battery technologies. All batteries prefer not to be made too hot, even the traditional lead-acid liquid battery.

    I cannot speak for Seadoo, but I suspect that the primary reason for the factory still including lead-acid batteries is low cost.

    The OEM lead-acid batteries are not terrible, just that the newer battery technologies are much better.

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  8. #7
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    What's annoying is that the AGM batteries are not as tall as OEM for Seadoo, so the you have to place a "riser" under the battery to ensure it fits nice and tight.

    Oh, and Gruss aus Florida...I lived in Bad Aibling Germany from 1988-1991 - loved every minute of it.

  9. #8
    Sanfish's Avatar
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    Quote Originally Posted by Xspook View Post
    What's annoying is that the AGM batteries are not as tall as OEM for Seadoo, so the you have to place a "riser" under the battery to ensure it fits nice and tight.
    It was no accident I wrote down the specific model number above.

    The "A" in ETX30LA means it includes the spacer. IIRC the spacer is 3/4"

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  11. #9
    Xspook's Avatar
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    Quote Originally Posted by Sanfish View Post
    Quote Originally Posted by Xspook View Post
    What's annoying is that the AGM batteries are not as tall as OEM for Seadoo, so the you have to place a "riser" under the battery to ensure it fits nice and tight.
    It was no accident I wrote down the specific model number above.

    The "A" in ETX30LA means it includes the spacer. IIRC the spacer is 3/4"
    Definitely will keep this for future reference.

  12. #10
    liquid chicken's Avatar
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    i bought that same battery and it came with the spacer. they thing i ran into it the spacer and battery were to tall so i trimmed a little off the spacer.

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