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  1. #1
    Senior Member Snowsurfer's Avatar
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    How big is it? (batteries that is!) lol

    How big is your battery? Give dimensions, chemistry, and capacity.

  2. #2
    Senior Member karma's Avatar
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    lifepo4 48v 10ah in series with 2x 12v sla 10ah +72v
    karmaelectronics.info
    youtube karmabike1

  3. #3
    Senior Member
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    my batteries of choice are limn
    from canadian tire/yardworks
    20v(21 fully charged) 5cell,bms
    6ah / 31amp
    weight is 2.76lbs or 1.25kg listed on paperwork(3lb 3oz/1.45kg on box)
    size for each battery...in my factory case already...
    2xbat =21v+21v=42v total 6ah
    my bike is ct schwinn izip/mongoose clone
    cost...109 for each bat 29 for each charger

    thx wasp
    Last edited by wasp; 08-20-08 at 05:45 PM.

  4. #4
    Senior Member Snowsurfer's Avatar
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    Exclamation

    Quote Originally Posted by karma View Post
    lifepo4 48v 10ah in series with 2x 12v sla 10ah +72v
    That can't possibly be good for the batteries, or your safety. Putting a 48V with a 12V and 12V in series?
    Mixing voltages and chemistries...

  5. #5
    Both Coasts...
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    Quote Originally Posted by Snowsurfer View Post
    That can't possibly be good for the batteries, or your safety. Putting a 48V with a 12V and 12V in series?
    Mixing voltages and chemistries...
    He never said he was CHARGING them in series. Drain is totally different and you obviously don't know as much as you think you do.

    As for your question - which battery pack? I use 5 different ones...

  6. #6
    Senior Member Snowsurfer's Avatar
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    Quote Originally Posted by BroadwayJoe View Post
    He never said he was CHARGING them in series. Drain is totally different and you obviously don't know as much as you think you do.
    Hey BroadwayJoe, quit trying to be so critical, and quit trying to start crap in my thread.

  7. #7
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    Hi all, first time poster, long time learner. I'm not sure if this is the best thread to jump into, nonetheless, I had never ever thought about mixing battery chemistries, but wouldn't hitting the lifepo4's low cuttoff voltage be worrisome to it's longevity? BTW, I don't have a Ebike, just a noob trying to get up to speed.

  8. #8
    Senior Member karma's Avatar
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    Quote Originally Posted by Snowsurfer View Post
    That can't possibly be good for the batteries, or your safety. Putting a 48V with a 12V and 12V in series?
    Mixing voltages and chemistries...

    no one charger for the lifepo4 and another for the sla, i see wasp is working on a lithium 20v pack from ct
    i may get rid of the sla.


    i have mixed them with no problems. the bms on the lifepo4 will only let you add another 12v without cutting out, when i get the new lithuim pack to replace it im moding the bms.

    im also working on a charger that will charger the complete set, im testing it right now works well, i have a thing for solid state chargers thay only last less than a year with me. this ones will be in a aluminum case
    on the wall with a lcd display to show charge state, kinda like the ev 1 charger that gm had
    Attached Images Attached Images
    Last edited by karma; 08-20-08 at 05:51 PM.
    karmaelectronics.info
    youtube karmabike1

  9. #9
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    size

    LiFePO4 36V 20Ah is approximately 6"x7"x8" and 24lbs !
    Attached Images Attached Images

  10. #10
    P7 Fanboy JinbaIttai's Avatar
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    Ping will configure his newer 36V 12Ah LiFePo4 two different ways:
    Either..6.3" x 2.96" x 9.45"
    or....... 6.3" x 5.91" x 4.73"

    No idea on weight yet.

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