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Old 05-24-2004, 09:52 AM   #16
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Thanks all. I borrowed a big battery that was used on a fishing boat all summer. I forget to check its CCa and Mah ratings. He charged it at 2amps overnight and I picked it up on way to track.

I should have paid more attention, but on its 4th charge it was still at 11.6 volts.

I charged 5-3300 packs from a trayed state and peaked 6 batteries. The charges were about 32 to 38 minutes and the peaks about 3 minutes.

I am not at all sure how many more charges I could have gotten, but I did get through the night with no problems.

Thanks for all the info,
Ray
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Old 05-24-2004, 01:11 PM   #17
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ray probably needed to be charges longer.
like an r/c battery they will go flat sitting on the shelf.
sometime those batteries need about 24 hours of charge time.
static voltage is useually 12. 4 to 12.6 vlts
on a good known batt. a batt is usually dead when the vlts are around 10.9 volts.
at that point a car wouldnt start and most gm cars will rum into drivabilty problems.
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Old 05-24-2004, 01:16 PM   #18
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Cool!! I dont know what the voltage would have been with a voltmeter and nothing charging at the time. Might have been higher??
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Old 05-25-2004, 03:32 AM   #19
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I use a 4 amp charger overnight on a smallish Deep cycle 12v battery and thats sometimes not enough to fully recharge it if I've really flattened it the previous day.

A larger battery will take much longer, especially at 2 amps.
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Old 05-25-2004, 04:06 AM   #20
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I use a 110ah leasuire battery and over the weekend got 20 charges out of it. On the last 2 charges, I had to drop the charge rate from 5.5a to 4.5 (well, my charger did it) but the cells worked fine, very "power hungry" track, which needed my best 3300's!
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Old 05-25-2004, 09:21 PM   #21
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anyone get weird behavior when charging at lower amp rates? like 1 amp? My charger went nuts.
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Old 05-25-2004, 10:00 PM   #22
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Ray,the battery you used was charged at 12 amps but goes into an automatic trickle charge.Though it was the first charge in a couple of months.I usually keep them charged evey month during the winter but do to my surgery this year ,I am a little behind.
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Old 05-25-2004, 10:01 PM   #23
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i bought the 12v 7amp battery from hobbico for starter boxes, i usually full charge my batts at home and just use the 12v to repeak a run, i only have 2 packs at the moment and havent gone more than 2 full charges on the batt, but it took it pretty well, stayed at 5 amps(charger max).

should i ditch this battery and just use a real car's batt?
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Old 05-25-2004, 10:03 PM   #24
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Quote:
Originally posted by GRIZZLY-A
Ray,the battery you used was charged at 12 amps but goes into an automatic trickle charge.Though it was the first charge in a couple of months.I usually keep them charged evey month during the winter but do to my surgery this year ,I am a little behind.
And so may, many thanks to you for letting me borrow it. I have to load up car-then 2 minutes later swap all the stuff into another car a few miles away early tomorrow what a pain!!! but the battery will be in it. I have not charged it.

Thanks again,
Ray
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Old 05-25-2004, 10:11 PM   #25
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rayhuang;

When I first started back up in Electric racing, I could charge about 8, 2000mah packs @ 5amps or less with a fully charged 24F Automotive Battery.

As I got more competitive my charge rates and Mah went up, the number of charges went significantly down.

I think you would be hard pressed to make a full day of practice and racing (5+ packs) on a full size Auto Battery charging 3300 packs at competitive charge rates.

Steven
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Old 05-26-2004, 01:25 PM   #26
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yes pops your right back in the day i would charge about 10 to 12 1200 or 1700 mah batteries. but take modern batts at 3300 that would be about half.
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