where's a battery expert when you need one?  
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where's a battery expert when you need one? - 1/5/2003 6:04:47 AM   
kbrent_d


 

Posts: 84
Joined: 1/5/2003
From: Chattanooga, Tn
Status: offline 		I was wondering if anyone out there could answer me a question.

Not to long ago I bought my son and I an
evader st truck and 1 each 1500 mah battery to go with it. After a few minutes of trying out our new hobby, I came to the conclusion that one battery each was
just not going to cut it. Back at the hobby
shop I asked some questions that should
have been asked the first time I went, they sent me home with 4 more batteries saying that a 3000 mah isn't going to last much longer in our trucks than the 1500 are. Now we have 6 batteries and have alot more fun but am just wondering if a 3000 would be more fun, if they don't have longer run times, than why pay the extra money for them?

< Message edited by kbrent_d -- Jan 5 2003 1:10AM >
       Post #: 1

where's a battery expert when you need one? - 1/5/2003 6:43:37 AM   
crash_me_over



Posts: 1702
Joined: 2/2/2002
From: Albion, WA, USA
Status: offline 		I also have the Evader (nice truck) and am using 3000mah NIMH batteries. As for run times......I can run about 20 - 30 minutes on one battery. Now you have to realize....this is not racing....but it is instead goofing around in my back yard. In fact....I have to stop for fear that the motor will get to hot when the temps outside are warm as in summer time.

I cannot explain why the guys there did not explain the differences but it's logical to believe that with higher capacities in batteries....your going to get longer usage times. I know I do.

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CMO

(in reply to kbrent_d)
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where's a battery expert when you need one? - 1/5/2003 6:47:15 AM   
mglavin



Posts: 5203
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		First off not all batteries of like capacity ratings are created equal. The primary difference is the average amperage and voltage they will discharge at. Low quality 1500mAh battery packs may provide an average voltage of 1 volt per cell multiplied by the cell count, typically six cells at possibly 10-15 amps discharge current for four minutes. A quality matched battery pack of like size will discharge at 1.1V for the same time period but deliver 20-30amps under load. There are various types of chemical make-up that effect the capacity ratings as well. A 1500mAh cell will deliver 1.5 amps for one hour @ 1.2V, multiplied by the cell count. In the case of a six cell battery that would typically be 7.2V at the start of the discharge. The voltage will fall off during the discharge, typically to 1V, anything below .9V per cell will damage the cell.

The hobby shop misguided you. A 3000mAh battery has twice the energy of 1500mAh, therefore it will run twice as long as a 1500mAh battery pack with a like load.....

You can't get something for nothing with batteries. The more you pay the more you get. The question is weather you need a pack that discharge at a high current. Most likely not unless your racing. A good quality 6 cell battery pack runs typically $30.00 with the low end sport packs around $15.00. Matched racing packs run anywhere from $50.00-$100.00...

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RCU Community Moderator
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(in reply to kbrent_d)
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where's a battery expert when you need one? - 1/5/2003 6:52:02 AM   
kbrent_d


 

Posts: 84
Joined: 1/5/2003
From: Chattanooga, Tn
Status: offline 		That sounds great. Maybe the guy at the hobby store didn't know what he was talking about, he said that the difference in run time would be "seconds" to quote him exactly. If you are getting that much run time out of a 3000, sign me up. Thanks for the reply, and please excuse me while I go out and buy a couple of 3000 packs.



(in reply to kbrent_d)
       Post #: 4

where's a battery expert when you need one? - 1/5/2003 7:13:43 AM   
crash_me_over



Posts: 1702
Joined: 2/2/2002
From: Albion, WA, USA
Status: offline 		I buy my 3000mah NIMH batteries on eBay. I buy two 7.2 volt batteries with charger for around $35.00. My wife bought the same setup for me at Radio Shack for $110.00. Of course the charger was a 2 battery charger and the one from eBay charges only one at a time.

_____________________________

CMO

(in reply to kbrent_d)
       Post #: 5

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