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What about these high powered electrical batteries for mcs?
Posted: Fri Nov 02, 2007 7:12 am
by ocean
Anyone been using these high powered electric batteries on motorcycles?
Looks darned fast! Wonder how well they will work in "regular" and older motorcycles ( like my 84 CS700S Honda Nighthawk S ) ?
A few links for those who are interested i just came across today -
http://www.killacycle.com/
http://www.youtube.com/watch?v=GDHJNG2PngQ
http://www.a123systems.com/newsite/index.php#
Posted: Fri Nov 02, 2007 10:25 am
by Sev
Those are electric motors, you're using a gas engine.
The batteries in the two different bikes are designed for two different purposes, and can release their power in two different ways.
Posted: Fri Nov 02, 2007 10:38 am
by mydlyfkryzis
The problem with all bikes is not the battery. The battery is for starting only. The battery is sized well for starting. The real problem is the charging system. The bike runs off the alternator when running and recharges the battery. To keep size, weight, and mechanical drag down, the alternators on most bikes is just not large enough to keep the battery charged. A big part of the problem is the range of RPM the alternator needs to deal with. On a car, most enines run under 6000 RPM. So a car alternator has to deal with 500 to 6000 RPM. On a bike, the range may go as high as 15000 RPM. If you make the alternator big enough to put out enough watts at idle, it is way too big for 15000 (or even 8500) RPM. In addition, a large alternator will draw a lot more HP from an engine that doesn't have it , especially at lower RPM. So the alternator is a compromise on size and output.
The result is, most alternators don't put out many watts below 3000 RPM or so. So if you ride around at low RPM a lot, you drain the battery. If you run higher RPM's, the battery stays charged.
Obviously, there are variations to this, V-Twin cruiser run a lower RPM range, and High performance inline 4's run much higher.
Your mileage may vary.....
It is a shame it is not easier to add capacity to the charging systems on bikes.
Putting larger batteries just adds to the weight, and if your motorcycle isn't keeping your battery charged now, a larger battery won't be charged by the system either.