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Old 02-26-2007, 11:25 PM   #1
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Battery capacity, doing the math?

I've just got some Trinity/Panasonic 1400scr +packs from Stormer Hobbies to use for stock class racing here in NZ.

As I don't yet have a fancy discharger to work all this out could someone please tell me what calculations I need to do to see if the packs are at least 1400 mah as stated on the label. These packs although new have probably been sitting on the shelf for years so I'm just curious to see how they've held up.

Charging at 500 mah the first pack took approx 2.5 hours to reach 10.10 volts. On a discharger of 17.5 amps it took 4m 50s to reach 5.4 volts.

I hope that's enough information.

Last edited by Mabuchi540; 02-27-2007 at 02:55 AM.
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Old 02-27-2007, 12:47 AM   #2
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That would put it at 1409mah.

4m 50s is 4.833 minutes which equals .08055hrs, at 17.5 amps it would be 17.5 x .08055 to get amphours(Ah) x 1000 to get mah= 1409 mah.
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Old 02-27-2007, 01:12 AM   #3
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Thumbs up Thanks very much.....

Quote:
Originally Posted by gubbs3
That would put it at 1409mah.

4m 50s is 4.833 minutes which equals .08055hrs, at 17.5 amps it would be 17.5 x .08055 to get amphours(Ah) x 1000 to get mah= 1409 mah.
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Old 02-27-2007, 01:18 AM   #4
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I'm more intrigued why you went for 1400's?

Surely its not a ruling that you have to run them?
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Old 02-27-2007, 01:33 AM   #5
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Post Well ok it's like this.....

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I'm more intrigued why you went for 1400's?

Surely its not a ruling that you have to run them?
Here in NZ the rule for onroad stock class (silver can 540 motors) is no battery with a capacity greater than 1500mah (unmatched) is allowed. Most run Sanyo 1300 scr's.

If I run on-road again I thought at $8.99 U.S these were a pretty good deal. But as it happens I'll be running off-road where there is no such limit on capacity and in stock anything goes so long as it's nicad/nimh and isn't over the current max capacity allowed.

However the weight limit for 2wd is 1474 grams and although almost everyone runs a higher capcity I got these packs just to see how it goes (like back in the day when I last raced...1992) with a battery that is 100 grams less in weight and might actually get me close to the limit. So basically an experiment.

I do have matched 3600/3700 packs of course.
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Old 02-27-2007, 01:38 AM   #6
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Boy thats a harsh rule.... But I suppose you all run under the same one so its equal.

I wouldnt even know where to get batteries like that!
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