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Lead acid batteries

Discussion in 'Bicycle Mechanics and Repairs' started by Maggot, 17 Sep 2007.

  1. Maggot

    Maggot Star of BBC 5Lives Ballot Box Brigade

    Location:
    Cheddar
    I have 2 sets of SMART lights, both the same, it's easier not to have to change the bracket and lights etc. They run on lead acid batteries. Can anyone remind me, should I discharge the battery fully before re-charging, or is it fine to re-charge a partially discharged battery.

    It's getting to that time of year when I will need them again.
     
  2. Elmer Fudd

    Elmer Fudd Miserable Old Bar Steward

    I usually, like my mobile, "kill" the battery once a week, batteries are better now than they used to be, they seem to have been able to by-pass the batteries "memory", but I still do it 'cos that's how I was taught.
     
  3. MrGrumpy

    MrGrumpy Huge Member

    Location:
    Fly Fifer

    "Lead acid batteries (as used in cars, and many power tools) not only do not need full cycle charge and discharge, but can be substantially damaged (at least insofar as forshortening their life) if allowed to ever fully discharge."

    taken from here http://www.thenakedscientists.com/forum/index.php?topic=7663

    don`t see an issue recharging but if they are left for any length of time then they are going to be goosed anyway.
     
  4. barq

    barq Senior Member

    Location:
    Birmingham, UK
    Like Mr Grumpy says, lead acid are batteries to top up rather than discharge.
     
  5. Tim Bennet.

    Tim Bennet. Entirely Average Member

    Location:
    S of Kendal
    Lead Acid batteries are very different beasts to any form of dry cell. They like to have a small partial discharge and then be immediately recharged. That's why they are so good for car starting: Modern cars hardly touch the capacity of their batteries before they fire up and start recharging.

    Even what are called 'Deep Cycle' wet cells (such as on milk floats and golf carts) shouldn't be taken below half charge if they are to have a maximum life (a rested, no load charge of 12.2 V is the limit of how far down you should discharge them - 12.6 V is full).

    So be nice to your battery: Don't over discharge it and always recharge it however little use it has had.