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Testing racecar battery

Posted: Sat Jan 06, 2018 7:10 pm
by oldhead
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

Re: Testing racecar battery

Posted: Sat Jan 06, 2018 8:06 pm
by Tuner
Touch it to your tongue, lick it.

Re: Testing racecar battery

Posted: Sat Jan 06, 2018 8:14 pm
by oldhead
Do you do that alot

Re: Testing racecar battery

Posted: Sat Jan 06, 2018 8:19 pm
by BrazilianZ28Camaro
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)

Re: Testing racecar battery

Posted: Sat Jan 06, 2018 8:23 pm
by 1972ho
You can take to Oreillys and have them do 1 hour load test.

Re: Testing racecar battery

Posted: Sat Jan 06, 2018 8:52 pm
by DaveMcLain
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.

Re: Testing racecar battery

Posted: Sat Jan 06, 2018 11:57 pm
by oldhead
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

Re: Testing racecar battery

Posted: Sun Jan 07, 2018 12:12 am
by joe 90
https://en.wikipedia.org/wiki/Lead%E2%80%93acid_battery

Discharge at the 10 hour rate and calculate capacity.

Re: Testing racecar battery

Posted: Sun Jan 07, 2018 11:24 am
by oldhead
This info. is to old its from 1859, My battery is newer :) :) :) :) :) :) :) :) :) :) Oldhead..PS:Are you that old?

Re: Testing racecar battery

Posted: Sun Jan 07, 2018 6:38 pm
by Keith Morganstein
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.
http://www.midtronics.com/transportation

Re: Testing racecar battery

Posted: Sun Jan 07, 2018 7:29 pm
by Alan Roehrich
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.

Re: Testing racecar battery

Posted: Wed Jan 17, 2018 12:38 am
by plg054
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.

Re: Testing racecar battery

Posted: Thu Mar 01, 2018 2:37 pm
by Fireonthemountain
Or for 50 dollars or less you could try this.


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

Re: Testing racecar battery

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