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#4540284 - 10/11/17 02:18 PM Schumacher BT-100 Battery Tester
ssamaroo01 Offline


Registered: 08/22/17
Posts: 51
Loc: Mt. Vernon, NY
I bought the Schumacher BT-100 battery tester earlier this year. I used it recently to test a 6 year old Motorcraft battery. The CCA on the label stated 590CCA. I measured 800CCA. I did the test a couple of times to make sure that I was reading it correctly. Is this normal?
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#4540316 - 10/11/17 02:44 PM Re: Schumacher BT-100 Battery Tester [Re: ssamaroo01]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35834
Loc: Great Lakes
AFAIK, battery CCA is tested at 0F. At higher ambient temperatures, the CCA reading will be higher.
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#4540330 - 10/11/17 03:02 PM Re: Schumacher BT-100 Battery Tester [Re: ssamaroo01]
Rand Offline


Registered: 08/20/03
Posts: 12638
Loc: NE,Ohio
you didnt test for CCA. because it wasnt 0f out(and the battery 0f)

and yes its makes a large difference.

Quote:


Cranking amps are the numbers of amperes a lead-acid battery at 32 degrees F (0 degrees C) can deliver for 30 seconds and maintain at least 1.2 volts per cell (7.2 volts for a 12 volt battery).

In other words, CA/cranking amps determine how much power you have to start your car in most climates. The basic job of a battery is to start an engine; it must crank, or rotate the crankshaft while at the same time maintain sufficient voltage to activate the ignition system until the engine fires and maintains rotation. This requirement involves a high discharge rate in amperes for a short period of time.

Since it is more difficult for a battery to deliver power when it is cold, and since the engine requires more power to turn over when it is cold, the Cold Cranking rating is defined as: The number of amperes a lead-acid battery at 0 degrees F (-17.8 degrees C) can deliver for 30 seconds and maintain at least 1.2 volts per cell (7.2 volts for a 12-volt battery).

In other words, CCA/cold cranking amps determine how much power you have to start your car on cold winter mornings.
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#4540412 - 10/11/17 04:43 PM Re: Schumacher BT-100 Battery Tester [Re: ssamaroo01]
JHZR2 Offline



Registered: 12/14/02
Posts: 41758
Loc: New Jersey
Usually there is a user interaction. You enter nameplate CCA and it reads out a value based upon that.

Are you saying you enter nothing and it just runs a test? I don't buy it.

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#4540445 - 10/11/17 05:36 PM Re: Schumacher BT-100 Battery Tester [Re: ssamaroo01]
doitmyself Offline


Registered: 06/03/02
Posts: 6213
Loc: MI
User error.....we guys never read the directions,LOL spank. The BT-100 is a load tester that only indicates a good/bad condition.

The OP didn't measure 800 CCA. The indicator needle stayed in the green section during the test. The Green section simply denotes good for batteries with a range of CCA rating from 200 to 1000 CCA .

Operators Manual: http://www.batterychargers.com/content/pdf/0099001450-R0.pdf

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#4540628 - 10/11/17 08:25 PM Re: Schumacher BT-100 Battery Tester [Re: ssamaroo01]
CT8 Offline


Registered: 10/09/14
Posts: 10920
Loc: Idaho
Those are low end testers and I have been using the likes at work for the past 30 years they work fine for what they are and plenty good to check the battery.
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#4540859 - 10/12/17 05:40 AM Re: Schumacher BT-100 Battery Tester [Re: doitmyself]
ssamaroo01 Offline


Registered: 08/22/17
Posts: 51
Loc: Mt. Vernon, NY
Originally Posted By: doitmyself
User error.....we guys never read the directions,LOL spank. The BT-100 is a load tester that only indicates a good/bad condition.

The OP didn't measure 800 CCA. The indicator needle stayed in the green section during the test. The Green section simply denotes good for batteries with a range of CCA rating from 200 to 1000 CCA .

Operators Manual: http://www.batterychargers.com/content/pdf/0099001450-R0.pdf


You were right. I read the directions and they are now clear. WOW what a difference!

Thank you everyone for your inputs. It was user error. What kind of battery testers are available to actually measure CCA? Before this tester, I used a regular DVM and measured voltages before and during starts. I'm used to testing telecom batteries, where we measure voltages before and after discharge, intercell resistances, and electrolyte levels.
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2000 E-250 4.2L 90k
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#4540862 - 10/12/17 06:02 AM Re: Schumacher BT-100 Battery Tester [Re: ssamaroo01]
JHZR2 Offline



Registered: 12/14/02
Posts: 41758
Loc: New Jersey
None actually test it. Some correlate an impedance measurement to a user input CCA value, but they are sensitive to temperature and state of charge.

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