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  #1  
Old 10-29-2003, 08:53 PM
bjv5 bjv5 is offline
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Join Date: Sep 2002
Posts: 133
Problem with 4cell

I am having problems with my spec2 when I added the 4th cell. I am charging it with the apex ac optional charger with the stock charging jack. The problem started 3-4 runs after running with the 4th cell (extremely fast). I then started to see a decrease in speed and later on the car would act as if it had only 3cells to power it. So I was wounder if I could find out what the problem is.
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  #2  
Old 11-03-2003, 01:14 PM
burgan burgan is offline
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Join Date: Sep 2003
Posts: 6
this is probably a "natural" thing..

particularly if you added a fourth cell to three cells that you already had run for a while.

the voltage of the 4 cells will start to drop after a few minutes so it will start to run like a 3 cell. under the same conditions the 3 cell would run even slower.

also, when you run 4 cells you are using more current so the battery's voltage will sag more quickly.
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  #3  
Old 11-03-2003, 06:26 PM
bjv5 bjv5 is offline
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thanx
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Old 08-09-2004, 10:02 PM
jasonip jasonip is offline
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Join Date: Aug 2004
Location: HK
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Actually if you look at the discharge charateristic of NiMH batt., you will know more why it slow down and act like a 3cell. When it is fully charged, each cell will around 1.4v (total 4cell ~5.7v) which has a higher top volt. and thus higher top speed.

After a while run each cell drops to a level ~1.1v which act like a fully charged 3cell(~4.3v).

You can refer to my another article for further information:
http://www.tinyrc.com/forums/showthr...threadid=19895
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