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Question about re-charging batteries

Discussion in 'Electronic Basics' started by mea305, Aug 12, 2006.

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  1. mea305

    mea305 Guest

    For those of you who may remember me, I am the person with the scooter
    that operates using two 12 volt lead, acid-free batteries. Finally, I
    was able to get an "excellent" re-charger, a 24 volt, 5 Amp charger
    that works perfectly, especially compared to anything that I have been
    able to buy anywhere. This one has a fan inside, is a three-step
    re-charger, and has done an excellent job in re-charging "all" of my
    batteries (having been through the process of buying three sets, all
    due to a lack of a good charger).

    Now, I have an important question: After re-charging the set of
    batteries that are currently in my scooter, I used the scooter to ride
    on the one and only road that is on the farm where I live. The road is
    approximately 1/4 to almost 1/2 mile in length and has a steady
    "incline" of about 2 degrees (I think that's the correct terminology;
    in any event, it does have sufficient incline to put somewhat of a
    strain on the batteries). After doing this twice (at this stage, I am
    merely "experimenting"), the "power level meter" on my scooter has
    moved down one "notch," with four notches -- all of which are

    Now, is this is "best time" to re-charge the batteries? Should I wait
    until the meter goes down to about 1/2 first?

    Also -- I used the new re-charger to charge the other batteries I also
    have (two other sets), and my wife helped me install them into the
    scooter -- just did this to ensure that they also did the same thing --
    which is that they registered a "full" power in the batteries, which
    "never" happened using the other charger I had -- a simple, plug-in,
    1000mAmp charger that only charged the batteries (at the most) up to
    1/2 of normal. When I read that it does more damage using a "cheaper,
    less powerful" charger to the batteries, I decided to wait for the
    arrival of my new, more powerful charger.

    With respect to these "stand-by batteries, should I "re-charge them"
    occassionally? Would having them sit for more than a few weeks cause
    more damage than putting them on the charger for the amount of time to
    re-charge? The unit takes about 1 hour to fully charge two batteries --
    what a difference!

    I would appreciate a response from those who have already helped me in
    the past, or anyone else who may know about this situation.


    Mark -- in Florida.
  2. a) Lead-acid batteries loose charge (slowly) over time so the "full"
    condition is questionable.
    b) One hour charging on DC simple cannot "fully" complete the chemical
    reactions needed. (True, the voltage may reach the "full" value but it
    means nothing). Too fast charging can dry the liquids.
    Note: Your alternator in car charges by rectifying three phase AC and is
    limited to ~50A current surges controlled by the battery voltage. This
    way of on-off charging is much more effective on letting the chemical
    reaction deep into the plates, giving different meaning to "full" charge.
    So you have to define to yourself what regiment of battery readiness you
    want to achieve and find a way to implement it.

    Have fun

    Slack user from Ulladulla.
  3. jasen

    jasen Guest

    "acid free" sealed lead gel-electrolyte batteries
    no. recharging immediately is best.
    But waiting until till half charge isn't much worse.

    it really depends on convenience.
    Yes. doing that every month or so should be plenty,
    every 6 months may be often enough.

    if you can contact the maker of the batterties they'll have a whole lot of
    info on how to best treat them.

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