02-12-2005, 08:59 PM
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TinyRC Pro
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Join Date: Mar 2004
Location: hawaii
Posts: 71
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5th 6th cells vs lithium?
okay so which is better?
and please dont tell me to search i sepnt half an hour looking for it
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02-13-2005, 08:18 AM
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TinyRC Newbie
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Join Date: Jan 2005
Posts: 8
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li-ion=less weight
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nsx
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02-13-2005, 01:06 PM
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I have a beach ball...
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Join Date: Jan 2003
Location: St. Louis, MO, USA
Posts: 774
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Li-Ion = Expensive, lightweight, and can handle higher current draw
6-cell = Cheap, but heavy.
In the end, they're both probably very similar as far as top speed goes, but you will notice the Li-Ion pull away from a 6-cell in a drag race.
__________________
'65 Ford Mustang
All the RS goodies
Nissan Skyline GT-R R34 *DEAD*
Becoming a donor car for:
'04 Ford Mustang Cobra
Soon to be fetted, li-ioned, and all kinds of other goodies.
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02-14-2005, 03:06 AM
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TinyRC Pro
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Join Date: Mar 2004
Location: hawaii
Posts: 71
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hmm thanks!
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02-15-2005, 06:03 PM
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Lithiums are deff lighter way lighter, almost as light as a stock car without batteries in it, 6 cell is super heavy but cheap way for big speed boost..if youve got extra cash get the lithiums
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02-23-2005, 11:37 AM
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Obsessive Modder
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Join Date: Nov 2004
Posts: 214
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You can add 2 extra AAAs to your car by just adding another link in the battery holder chain that is the harness. The negative from one goes to the positive on the next, etc. The lithium upgrade either requires you getting 4 AAA lith-ions (only one place has them that I currently know of), which may actually be too much voltage, or 2 AAs, which is much more common, as they lighten the car.
However, with the 6 cell, you're getting 50% more voltage, and with the lith-ion, your getting a lot as well, and you risk frying the FETs (the small black chips on the control board that take small on/off signals and use them to turn on the much bigger power connection between the motor and the battery). Solutions: 1) stacked fets, whereby you solder another pair on top of the originals, sharing the workload, 2) external turbo whereby the FETs are offloaded to an external board, allowing more MUCH higher voltages (I'll melt wires before I melt my board or turbo), and sometimes sending regulated 5V power back to the control board. The good thing here is that the steering servo is getting 5 volts instead of the regular 6, so it jitters less, while the much higher power still gets fed to the motors.
BTW: Make sure if you go lith, to get lithium-ION, and not just lithiums, as the regular liths are not rechargeable.
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