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.

1

The battery is tested in a water bath maintained at 105 ± 5 F.

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

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.

4

The battery is given a 60 h stand on open circuit in the water bath.

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.

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.

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.