86 Amp Hour Battery

Discussion in 'Electric Bicycles' started by mikem, Mar 31, 2009.

  1. mikem

    mikem Member

    The site below lists a battery that claims 86.4 amp hours. It weighs 62 pounds and measures 12"x6"x9". Price is $210 plus shipping ... which should still keep it under $300 to most places I'm guessing.

    Anyway, this seems to be about 3 or 4 times the amp hours than most ebike bike batteries are rated for. Has anyone tried this type battery on a bike?




    Last edited: Mar 31, 2009

  2. loquin

    loquin Active Member

    it's a 12V battery. Most ebikes use at least 24v, usually 36v, and sometimes 48 volts.

    So, you would need 2, 3, or 4 of these batteries. (total battery weight, 124 pounds, 186 pounds, or 248 pounds.

    There's a reason why ebikes use smaller capacity batteries, and that is it... you just can't lug around that much dead weight.
  3. mikem

    mikem Member

    Small Rider + Big Battery = Long Range?

    Thanks loquin. I wonder if it would work for a 150 pound rider on a trike or heavy duty Worksman type bike? Total weight could still be in the 300 pound range.?
  4. AussieJester

    AussieJester Member

    I couldnt imagine how badly it would handle, running 4x12volt 20ah batteries on my trike is bad enough IMO AND thats on a custom made frame ALOT heavier duty than anything comercially available, i don't think the weight of the batteries on your 'standard' store bought trike would be very advisable, i think it would stress the frame a liiiil too much to be safe...then add the weight of the rider on top of that then the forces when your actually in motion, hit a pot hole the wheel would instantly collapse, they simply aren't made for the weight/forces that they would be put under with this amount of 'cargo' on board to top it off MOVING that wieght would eat into those gloriously high AH's anywayz, prolly end up better off with less amp hour and half the weight in the long run anywayz? be AWSOME of they were a 48volt battery instead of 12 volt, id grab one and charge it once a week hahaha
    Last edited: Apr 1, 2009
  5. mikem

    mikem Member

    Thanks Jester. Always good to hear from the guy who owns one ... especially when that guy built one too!

    However, on paper, this still seems like it might be doable so I hate to stop dreaming just yet. What do you think of this ...

    Worksman says their trikes can handle a 550 pound load. Here's their site:


    So, though it would be pushing it, even with a fat old 200 pound guy like me there would be room for a couple hundred pounds of battery and still be more than 100 pounds under the bike's limit ... theoretically, anyway.

    Now I know you wouldn't want to hit a pot hole with a "tank" like this but barring bad road hazzards do you think there might be any potential here? Would this kind of weight cancel out the advantage of having a 175 AH power pack?
  6. ozzyu812

    ozzyu812 Member

    Last year I saw a few builds with car batts. I don't know how sucessful they where in the long HAUL.
  7. JinbaIttai

    JinbaIttai Member

    When you have that much weight on it and you have to add even more weight to beef everything up, it is getting to the point where there is no way it can be pedaled without constant assist--and the pedals are more of a decoration. At that point it it closer to some other kind of electric vehicle than an electric bicycle, so may as well abandon the bike part of the design.
  8. AussieJester

    AussieJester Member

    Yes it would be doable but as previously suggested it would handle like poo... thats an awful lot of weight to be stopping also, how do you think the 'standard' brakes would cope with this? I put 4 disks on my build (twin rotors up front and one on each rear wheel) too pull the heavy weight up, it works well but i wouldn't like to try it with v-brakes or worse a coaster brake...I think the added weight would impact GREATLY on the large amp hours also, take alot of energy to move that trike piled with the weight...RE: car batteries...they dont handle the constant fast draining as per what happens in e-bike use and in the "long haul" which won't be that 'long' their capacity (ability to hold charge) would rapidly diminish...Personally, I believe 4 or 6 20ah 12 volts in series will be a better solution :: wink :: Please bere in mind this is only MY opinion and you shouldn't take it as "gospel" my all means be the 'pioneer' and see how it does perform we might all be wrong ;-) Best of luck anywayz buddy... :)

    Last edited: Apr 2, 2009
  9. HoughMade

    HoughMade Guest

    That's what my wife says.
  10. duivendyk

    duivendyk Guest

    This rating of batteries by AH is not all that informative,if the voltage is not quoted also.It would be much better if the energy storage was listed (Watthour rating).That would allow better comparison ($$/WH) or WH/lbs between batteries regardless of battery voltage.
  11. mikem

    mikem Member

    I think watt hours can be calculated by multiplying volts X amp hours ... but I'm not sure. Hopefully someone that knows will let us know.

    Here's a handy site dealing with this subject. It may verify the formula above ... I haven't checked it out completely yet.

    Last edited: Apr 3, 2009
  12. Fuzzo

    Fuzzo Member

    My bike is 12 volts so it would actually be fine. And 86Ah is about 10 times my current battery capacity, which can push me for about 20-30 km (depending on whether I pedal). OK, it's 62 pounds, but subtract the existing 20 pounds and that gives 42 pounds more than my usual load. The current total weight it's pushing (including me) is on the order of 240 pounds, so it's only adding 15% weight. Rough guessing puts the distance my bike with that battery could go at about ( 10 x 25 ) * 85% = 215 km. Around 10 hours continuous riding. Enough to ride to the next city and back. That's a pretty capable bike - you could tour on something like that. But where to put that huge battery?
  13. duivendyk

    duivendyk Guest

    On a trailer would make the most sense.15 km with at the most 12x8.6?=100 Watt hrs implies about 130W power assist,(45 min at 20km/hr).In hilly terrain the range would be a lot shorter.
  14. Fuzzo

    Fuzzo Member

    A trailer would make sense for touring. Especially a 'braked trailer', if there is such a thing for bikes.