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27 / 77

SAFETY

SLA battery (of 25 Ah or smaller capacity) safety test items

Item 1. Shock test (Drop test)

Test method A fully charged battery is allowed to drop in the upright position from the height of 20 cm onto a hard board having a thickness of 10 mm or

Check point The battery should be free from noticeable breakage or leaks; and its terminal voltage should be held higher than the nominal voltage.

2

Vibration test

  • 3.

    Oven test

  • 4.

    Coldproof test

  • 5.

    Heat cycle test

  • 6.

    Short circuit

test

7. Large current discharge test

8. Vent valve function test

9. Overcharge test

more. Test is repeated three times. A vibration frequency 1000 times/minute and amplitude 4 mm is applied to the X-, Y- and Z- axis directions of a fully charged battery for 60 minutes respectively. A fully charged battery is left standing in an atmosphere of 70C for 10 hours. A fully charged battery is connected to a resistor equivalent to 60 hour rate discharge and left for 4 days; then the battery is left standing in an atmosphere of -30C for 24 hours. A fully charged battery is exposed to 10 cycles of 2 hours at -40C and 2 hours at 65C. A fully charged battery connected with a small resistor of 10 ohms or less is allowed to discharge. A fully charged battery is allowed to discharge at 3CA to 4.8V / 6V battery level. (This test is not applicable to batteries having built-in thermostat.) A fully charged battery is submerged in liquid paraffin in a container, then overcharged at 0.4 CA. (UL1989) A fully charged battery is overcharged at 0.1 CA for 48 hours, left standing for one hour, and allowed to discharge at 0.05CA to 5.25V / 6V battery level.

No battery part should be broken; the battery should be free from leaks; and its terminal voltage should be held higher than the nominal voltage. The battery case should not be deformed; the battery should be free from leaks.

No crack should develop in the battery case; the battery should be free from leaks.

No crack should develop in the battery case; the battery should be free from leaks.

The battery must not burn nor burst.

The battery must not burn nor burst, and it should be free from battery case deformation, leaks and any irregularity in the internal connections. Release of gas from the vent should be observed.

No irregularity should be noticed in the battery appearance; the battery should retain 95 % or more of the initial capacity.

(Note) The above safety notes apply only to standalone batteries, not to embedded batteries.

Sealed Lead-Acid Handbook, Page 27

January 2000

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