help in charging lead acid battery

Discussion in 'General Electronics Chat' started by alitex, Mar 22, 2012.

  1. alitex

    Thread Starter Active Member

    Mar 5, 2007
    122
    0
    hi all...
    i bought new lead acid battery 12 V. can any one tell me what is the best voltage value to charge it, and what about the time charging???
    thank's...
     
  2. jimkeith

    Active Member

    Oct 26, 2011
    539
    99
    You can charge it at 14V until the current tapers to very low, but it is OK to leave it at 14V for long periods of time.
     
  3. wmodavis

    Well-Known Member

    Oct 23, 2010
    737
    150
  4. #12

    Expert

    Nov 30, 2010
    16,252
    6,751
    This is the reference that did it for me.

    http://www.engineersedge.com/battery/specific_gravity_battery.htm

    That link to Battery University says, charge at 14.4 to 14.7 as a constant voltage, then float at 13.5V to 13.8V
    The time to get a full charge depends on how much current the battery accepts and how many amp-hours it needs to arrive at "fully charged".

    Bubbling is a sure sign the battery is "full". That's when you change to the float charge voltage.

    On the other hand, I bought an AGM battery (absorbent glass mat) and the label on it convinced me to float it at 14.2V
    If it has a label, follow the instructions.
     
    Last edited: Mar 22, 2012
  5. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    For long term float charge, about 13.2V is good.
     
  6. alitex

    Thread Starter Active Member

    Mar 5, 2007
    122
    0
    thank's to all, is there problem of use it to full discharge?
     
  7. #12

    Expert

    Nov 30, 2010
    16,252
    6,751
    Yes. Lead acid batteries have shorter lifespan when deeply discharged.

    I don't know the specifics but it comes down to, "How much sooner are you willing to buy another battery for the convenience of running it completely dead?"
     
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