A-A-50612 Battery, Storage (Portable, Sealed, Maintenance-Free, Lead-Acid) 12 Volt, 50 Ampere-Hour, Type 12V-S-50 Ah

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A-A-50612

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 5 ampere (or 10 hour) rate shall be a minimum of 50 ampere-hours with a cut-off voltage of 10.5 volts in the temperature range of 20° to 27° C.

b. The capacity for the 16 ampere (or 2 hour) rate shall be a minimum of 32 ampere-hours with a cut-off voltage of 9.6 volts in the temperature range of 20° to 27° C.

6. Reserve capacity. The battery shall deliver 25 amperes for a minimum of 60 minutes at 25^oC with a cut-off voltage of 10.5 volts.

7. Retention of charge. The battery shall retain at least 80% of the 10 hour-rate capacity (50 ampere-hours) 28 days after charge termination when discharged at the 10 hour rate.

7. Cycling. The battery shall be capable of 270 cycles minimum. The cycles shall consist of any combination of the requirements listed in paragraphs 5 and 7 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 per cell with a limiting current of 10 amperes.

9. Each battery shall provided with a lifting device or system to facilitate manual or mechanical handling.

10. Bid samples. When specified in the solicitation, bid samples shall be furnished.

Contractor Certification. The contractor shall certify and maintain substantiating evidence that the product offered meets the salient characteristics of this Commercial Item Description, and that the product conforms to the producers own drawings, specifications, standards and quality assurance practices. The government reserves the right to require proof of such conformance prior to first delivery and thereafter as may be otherwise provided for under the provisions of the contract.