12 volt battery help please?

Discussion in 'Electronics Resources' started by mctscott123, Jan 15, 2015.

  1. mctscott123

    Thread Starter New Member

    Jan 15, 2015
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    I just bought a new Die hard 12 volt 2 amp battery charger for my Lead sealed 1.3ah and 8ah batteries and when plugged in and charging there is a noise as if it is boiling inside, yet there is not a lot of heat at all... is this bad? any suggestions? should i return the charger and get a smaller amperage charger or what should i do?
     
  2. MaxHeadRoom

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    Jul 18, 2013
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  3. alfacliff

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    Dec 13, 2013
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    they arent boiling, they are gassing off. charging battteries releases hydrogen gas.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Completely sealed GelCells?
    Max.
     
  5. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Post a link to the battery data sheet(s).

    Post a link to the specifications for the battery charger.

    Usually, chargers for flooded automotive batteries are not suitable for SLAs, and vice versa.
     
  6. alfacliff

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    gel cells are not completely sealed, they would preasure up and explode if they were.
     
  7. MaxHeadRoom

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    Last edited: Jan 15, 2015
  8. mctscott123

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    Jan 15, 2015
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    these are universal 12 volt lead sealed batteries, i dont really know much more than that about them...
     
  9. MrChips

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    Oct 2, 2009
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    What's making the boiling noise, the charger or the battery?

    Get a proper SLAB (sealed lead-acid battery) staged charger.
    Don't let the battery voltage run down.
    Don't overcharge the battery.

    Here is what happens when you overcharge a SLAB or when the charger fails to go to STAGE 3 (float charge):

    [​IMG]
     
  10. mctscott123

    Thread Starter New Member

    Jan 15, 2015
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    the batter makes the noises, isnt it just a case of getting a different charger? it didnt make that sound with my last charger
     
  11. wmodavis

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    Oct 23, 2010
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    What you should do is to follow the battery manufacturers recommendations for the specific model of battery that you have. They know what it needs to safely charge it while preserving maximum battery life.
     
  12. crutschow

    Expert

    Mar 14, 2008
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    I think generally you should not charge a battery at a rate more that about 1/10 of its AH rating. On that basis 2A is way to much for your batteries and that's why they are gassing (boiling).
     
  13. mctscott123

    Thread Starter New Member

    Jan 15, 2015
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    thank you for all of your help everyone! so glad i joined this forum!
     
  14. #12

    Expert

    Nov 30, 2010
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    My Sears lawn mower came with a battery charger that was guaranteed to destroy the battery in a few weeks. Being a wise guy, I added a regulator to it and saved myself a lot of aggravation. Imagine, expecting the parts that come all in one box to be compatible with each other!

    Anyway..the right answer is to get the right charger.
     
  15. mctscott123

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    Jan 15, 2015
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    could i just add an inline 500ma fuse or something and it work? or too simple?
     
  16. #12

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    Not a chance.
    You need to feed the battery with the right amount of current in one stage and the right amount of voltage in other stages. I just did a single voltage regulator with a 0.1 amp limit at all times. It's been working for 2 years, so far. I'm sure there is a more, "right" way to do it, but I'm not maintaining hundred dollar batteries. I'm working with (1) 3 or 4 amp-hours worth of battery. It's AGM. Absorbent Glass Mat. Read your label to find what kind you have then go to batteryuniversity.com to read all about it.
     
  17. mctscott123

    Thread Starter New Member

    Jan 15, 2015
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    okay, thanks a bunch
     
  18. crutschow

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    A fuse would just blow and the battery thus wouldn't charge.
    A suitable resistor in series with the battery may work but you would need to experiment to see what value gives the proper charging current.
    The correct value likely would be in the neighborhood of a few ohms with a 5W rating.
     
  19. bwilliams60

    Active Member

    Nov 18, 2012
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    Gel cell batteries are recombinant batteries and are sealed. They are not made to be boiled and that is why they have special chargers which usually regulate the battery at 14.1 VDC maximum. If they are charged at a higher rate, they will boil and trip the pressure sensitive vents allowing the gas to escape. If done enough, the electrolyte dries up and then you end yo with the picture that Mr. Chips provided. Any gassing is made to recombine with the electrolyte in a special housing in the case.
     
    #12 likes this.
  20. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    What are you talking about? Picture, schematic, link?
     
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