A-A-50616
4. Pressure relief valve. The battery shall have sufficient pressure relief valves to prevent rupturing of the battery when internal pressure exceed battery design pressure.
5. Capacity.
a. The capacity for the 13 ampere (or 10 hour) rate shall be a minimum of 130 ampere-hours with a cut-off voltage of 10.5 volts in the temperature range of 20o to 27o C.
b. The capacity for the 42.5 ampere (or 2 hour) rate shall be a minimum of 85 ampere-hours with a cut-off voltage of 9.6 volts in the temperature range of 20o to 27o C.
c. The capacity for the 312 ampere (or 5 minute) rate shall be a minimum of 26 ampere-hours with a cut-off voltage of 7.2 volts in the temperature range of 20o to 27o C.
6. Reserve capacity. The battery shall deliver 25 amperes for a minimum of 210 minutes at 25°C with a cut-off voltage of 10.5 volts.
7. Cold cranking performance at -18oC (0oF). The battery shall deliver 965 amperes for a minimum of 30 seconds at -18°C with a cut-off voltage of 7.2 volts.
8. Retention of charge. The battery shall retain at least 80% of the 10 hour-rate capacity (130 ampere-hours) 28 days after charge termination when discharged at the 10 hour rate.
9. Cycling. The battery shall be capable of 90 cycles minimum. The cycles shall consist of any combination of the requirements listed in paragraphs 5, 7 and 8 with a minimum of 80% capacity at the specified rate. At least one cycle of each capacity check listed in paragraph 5 shall be conducted for verification. Only cycles yielding 80% or greater capacity are to be counted.
Charging shall be conducted with a constant potential charger set at 14.1 volts with a limiting current of 30 amperes.
10. Each battery shall be provided with a lifting device or system to facilitate manual or mechanical handling.
11. Bid samples. When specified in the solicitation, bid samples shall be furnished.
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