J240_197105 LIFE TEST FOR AUTOMOTIVE STORAGE BATTERIES
Issued
05/01/1971
- Features
- Issuing Committee
- Content
- This life test simulates automotive service where the battery operates in a voltage regulated charging system. This test subjects the battery to charge and discharge cycles resulting in failure modes comparable to those encountered in automotive service.
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1
The battery is tested in a water bath maintained at 105 ± 5 F.
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2
The test cycle is performed as follows:
Discharge: 2 min at 25 A Charge: -
(a)
maximum voltage — 14.8
-
(b)
maximum rate — 25 A
-
(c)
time — 10 min
-
(a)
-
3
The battery is continuously cycled for 100 h (for example, Mon day noon until 4:00 p.m. Friday).A switching delay of not more than 10 s is permitted from termination of charge to start of discharge, and termination of discharge to start of charge.
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4
The battery is given a 60 h stand on open circuit in the water bath.
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5
Discharge battery at a rate equal to its 0 F cold cranking discharge rate in amperes, at the battery temperature obtained in paragraph 4, to an end voltage equivalent to 1.20 V per cell, or a minimum discharge time of 30 s, whichever occurs first.
-
6
Replace battery on the cycling test without a separate recharge. Start on the “charge” portion of the cycle.
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7
The life test shall be considered completed when the battery fails to maintain 1.2 V per cell for a minimum of 30 s on the manual discharge (paragraph 5).The point of failure shall be determined by plotting the 30 s discharge voltage values.
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8
Water should be added as required during the cycling portion of the test.note: This test only applies to 12 V batteries of 180 min or less Reserve Capacity.
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1
- Pages
- 1
- Citation
- SAE International Recommended Practice, LIFE TEST FOR AUTOMOTIVE STORAGE BATTERIES, SAE Standard J240_197105, Issued May 1971, https://doi.org/10.4271/J240_197105.