Electric Barstool Racer

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cboy

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dude when i'm talking about sealed i'm talking abotu AGM batteries

they dont "spill" even in a crash....

please do your research before you suggest people use standard flooded batteries which will leak if tipped over.

this is a AGM sealed battery that has been cut open, if this was a flooded batter there would be acid everywhere.



AGM batteries are just like flooded lead acid batteries, except the electrolyte is being held in the glass mats, as opposed to freely flooding the plates. Very thin glass fibers are woven into a mat to increase surface area enough to hold sufficient electrolyte on the cells for their lifetime. The fibers that comprise the fine glass fibers glass mat do not absorb nor are affected by the acidic electrolyte they reside in. These mats are wrung out 2-5% after being soaked in acids, prior to manufacture completion and sealing. The AGM battery can now accumulate more acid than is available, and never spill a drop.

The plates in an AGM battery may be any shape. Some are flat, others are bent or wound. AGM batteries, both deep cycle and starting, are built in a rectangular case to BCI battery code specifications. Optima Battery builds a patented cylindrical AGM series of batteries that are fashioned to fit the same BCI battery size specifications as any other battery.

[edit] Advantages All AGM batteries have enhancements over flooded lead acid batteries:

Purer lead in the plates, as each plate no longer needs to support its own weight, due to the sandwich construction with AGM matting. Traditional cells must support their own weight in the bath of acid.
Fluid retention - un-spillable
High specific power or power density, holding roughly 1.5x the AH capacity of flooded batteries due to purer lead[citation needed]
Low internal resistance allowing them to be charged and discharged quite rapidly
Water conservation - never requires addition of water
Acid encapsulation in the matting
Operation well below 0°F or -18 °C.
Availability of UL, DOT, CE, Coast Guard, and Mil-Spec approved types
Vibration resistance due to the sandwich construction.
 

cboy

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scooterman - glad you concede. =p

Toystory- when i said sealed i meant AGM which is what the OP was talking about when he said he had 4 scooter batteries. They dont use flooded batteries.
 

Doc Sprocket

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Fair enough. I assumed flooded, because in my region, "sealed" is synonymous with "maintenance free". AGM is AGM, gel cells are gel cells.

That's not to say that in lower speed applications a flooded battery cannot be used safely. With the right precautions it can. But it's certainly not the best choice by any stretch.
 

cboy

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toystory - ah i understand. I didnt look to see you were in Canada and didnt realize that they had different meanings there. That makes sense.

and true, with the battery box you suggested it would work. I've seen some crazy youtube videos with gokarts w/ massive car batteries doing crazy burnouts.

 

Doc Sprocket

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Unfortunately, some people truly are bent on proving the whole "survival of the fittest" thing. But that was some good battery info you put up there, hopefully some folks will learn from it.
 

toughjj

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A controller is perhaps the best option. I remember I saw somewhere on a power chair "do not connect the power directly to the motor" or similar. Due to the high opposing torque you may damage the motor or the transmission (especially if you're running it at 36 V). A simple way to test before you buy is to use a 4 position switch (you'll have to find one that can take at least 20A) and as you have the 3 batteries wired in series (one after each other) you have access to 12 V, 24 V and 36 V if you include one, two or all three batteries in the motor's circuit. So you leave the first position of your switch not connected (to have a "zero" position), connect the 2nd to 12 V, 3rd to 24 V and 4th to 36 V. You can start at 1/2 the motor's nominal voltage and as you pick up some speed you switch to the next step and get more torque/speed. I tested this using 3 regular, 3 terminal light switches (you gotta make sure you're not short-circuiting the batteries...) and it appears to work fine. Using 3 switches may not be the best solution (except for testing) I'm now looking for that 4 positions switch that would do the trick. You could also use a low current switch that controls 3 solenoids... but for the price you're probably better with a "full featured" controler. If you find such a switch you could connect it to the "gas" pedal... etc.
 

oscaryu1

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The concept of AGM and "maintenance" free batteries are essentially the same. You won't "spill" any acid if you crack them, period. Any SLA (SEALED lead acid). In this case, it's generally a special type of fibreglass or whatnot which holds the electrolyte. You can remove the protective caps on "maintenance free"/SLA's and hold them upside down and nothing will come out.
 
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