Testing racecar battery

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oldhead
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Testing racecar battery

Post by oldhead » Sat Jan 06, 2018 7:10 pm

I am in phila. we race from march to november. I drive mine every week or so during the winter. How do you test your battery for the coming season :) :) :) :) Oldhead
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Tuner
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Re: Testing racecar battery

Post by Tuner » Sat Jan 06, 2018 8:06 pm

Touch it to your tongue, lick it.

oldhead
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Re: Testing racecar battery

Post by oldhead » Sat Jan 06, 2018 8:14 pm

Do you do that alot
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BrazilianZ28Camaro
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Re: Testing racecar battery

Post by BrazilianZ28Camaro » Sat Jan 06, 2018 8:19 pm

oldhead wrote:
Sat Jan 06, 2018 7:10 pm
I am in phila. we race from march to november. I drive mine every week or so during the winter. How do you test your battery for the coming season :) :) :) :) Oldhead
Do a full recharge, if its holds more than 12.8V after an hour you good to go. (assuming its a 12V batt)
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Re: Testing racecar battery

Post by 1972ho » Sat Jan 06, 2018 8:23 pm

You can take to Oreillys and have them do 1 hour load test.

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Re: Testing racecar battery

Post by DaveMcLain » Sat Jan 06, 2018 8:52 pm

To properly test a battery you really need a carbon pile type of load tester where you can crank up say a 400 amp load and watch the voltage. A good healthy battery will pull down but when the load is removed return to near its full voltage over and over again. A weak battery will fall off to less than 9.5 volts very quickly and not recover. Cheap electronic battery testers will not do this.

oldhead
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Re: Testing racecar battery

Post by oldhead » Sat Jan 06, 2018 11:57 pm

DaveMcLain wrote:
Sat Jan 06, 2018 8:52 pm
To properly test a battery you really need a carbon pile type of load tester where you can crank up say a 400 amp load and watch the voltage. A good healthy battery will pull down but when the load is removed return to near its full voltage over and over again. A weak battery will fall off to less than 9.5 volts very quickly and not recover. Cheap electronic battery testers will not do this.
Now this sounds like a real load check,How low do you take the volts on the pull down?????Oldhead
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Re: Testing racecar battery

Post by joe 90 » Sun Jan 07, 2018 12:12 am

https://en.wikipedia.org/wiki/Lead%E2%80%93acid_battery

Discharge at the 10 hour rate and calculate capacity.

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Re: Testing racecar battery

Post by oldhead » Sun Jan 07, 2018 11:24 am

This info. is to old its from 1859, My battery is newer :) :) :) :) :) :) :) :) :) :) Oldhead..PS:Are you that old?
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Re: Testing racecar battery

Post by Keith Morganstein » Sun Jan 07, 2018 6:38 pm

The Midtronics style of tester is used by most shops these days. Many auto parts stores will test your battery with one for free. I’ve used one for over ten years now.
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Re: Testing racecar battery

Post by Alan Roehrich » Sun Jan 07, 2018 7:29 pm

O'Rielly's uses the AutoMeter battery tester and charger now.

Absolutely the very best battery tester is an old Sun VAT-28 carbon pile load tester.

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Re: Testing racecar battery

Post by plg054 » Wed Jan 17, 2018 12:38 am

With all the batts on our farm I bought a Solar BA-5 tester a few years back that will check volts CCAs and such. Best piece of test equip I ever bought. Plug.

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Re: Testing racecar battery

Post by Fireonthemountain » Thu Mar 01, 2018 2:37 pm

Or for 50 dollars or less you could try this.


https://www.youtube.com/watch?v=iFCCF6extfQ

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Re: Testing racecar battery

Post by Dan Timberlake » Wed Mar 07, 2018 5:40 pm

OTC 3180. is an old school tester that monitors voltage while asking it to discharge at about 100 Amp rate into a big old resistor. Makes some heat ( 1200 watts) so the test should only be run for 10-15 seconds. The old Carbon pile is likely better, but it it will bring a marginal battery, or under charged battery to it's knees.
https://images-na.ssl-images-amazon.com ... L1170_.jpg

They have got pretty cheap recently.

Works on 6 and volts, and has a decent analog volt meter built in to test alternator charging, too

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