Lead Acid batteries for electric bicycle

Discussion in 'The Projects Forum' started by withoutego, Jan 15, 2016.

  1. withoutego

    Thread Starter New Member

    Dec 22, 2015
    23
    4
    Hello all, This might be my first post here. I am looking
    for someone with specific experience of using lead acid
    batteries for powering an electric (assist) bicycle. I would
    use Lithium chemistry but I live in Ecuador and importing
    anything is a hassle.....those batteries top the list because
    of their nature and history.

    I would use deep cycle types. The load, the motor, hasn't
    been purchased (I am making the trade-offs now) but
    something between 350W and 1500W. The trip time is
    short. Any tricks to make the normal lead acid a better
    fit with the requirements of peddle assisting?

    I might just try to use a normal (and less expensive) vehicle
    battery. Then match the demand of a car...ie a dead
    short (the starter) a couple of times a day (going full power
    up a hill) and otherwise a 20A drain to 80% capacity and
    daily top off. Should then last as long as it would in a car.

    I think I'll build the bike in Maine in the summer and when
    I fly south again take it with me. Still can not fly with the Li ion
    power pack I would want. 4800 Watt hours would be nice

    Thanks.....KC1CCG
     
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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  3. withoutego

    Thread Starter New Member

    Dec 22, 2015
    23
    4
    Thanks, I will go through that material. still, SLA would trump nothing at all.
     
  4. tcmtech

    Well-Known Member

    Nov 4, 2013
    2,034
    1,632
    Standard UPS unit batteries work really well for small EV applications beng they are basically a mini deep cycle battery and designed to work with high load applications with the high likely hood of having to sit in a discharged state for some time before being recharged.

    If the bike is for a full sized adult I would go with the biggest motor and batteries that you can fit. 350 watts doesn't do much for anyone who is much over kid sized.
     
  5. withoutego

    Thread Starter New Member

    Dec 22, 2015
    23
    4
    I read thru the reference links, thanks. I was surprised that in China the
    SLA was most common, price being an over "riding" criteria.

    I would agree with the power level. Having 1500 watt motor doesn't
    mean the rider must run at that power level all the time.

    I am in Ecuador most of the year and that is the wild card in these
    projects. Otherwise Li ion and ebay, slam dunk....not easy here. But
    then I am not shoveling snow right now, another trade off.

    Thanks all for the input.
     
  6. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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