A-A-50619 Battery, Storage (Portable, Sealed, Maintenance-Free, Lead-Acid) 6 Colt, 780 Ampere-Hour, Type 6V-S-780 AhThis Commercial Item Description covers a 6 volt, 780 ampere-hour sealed, valve-regulated lead-acid (VRLA), storage battery with a low rate and deep discharge duty cycle for use in Naval surface ships.

Pages 1 - 2 - 3 - 4

A-A-50619

4.  Pressure relief valve. The battery shall have sufficient pressure relief valves to prevent rupturing of the battery when internal pressure exceeds battery design pressure.

5. Capacity.

a. The capacity for the 78 ampere (or 10 hour) rate shall be a minimum of 780 ampere-hours with a cut-off voltage of 5.25 volts in the temperature range of 20° to 27° C.

b. The capacity for the 260 ampere (or 2 hour) rate shall be a minimum of 520 ampere-hours with a cut-off voltage of 4.8 volts in the temperature range of 20° to 27° C.

6. Reserve capacity. The battery shall deliver 25 amperes for a minimum of 45 hours at 25°C with a cut-off voltage of 5.25 volts.

7. Retention of charge. The battery shall retain at least 80% of the 10 hour-rate capacity (780 ampere-hours) 28 days after charge termination when discharged at the 10 hour rate.

8. Cycling. The battery shall be capable of 90 cycles minimum. The cycles shall consist of any combination of the requirements specified in paragraphs 4 and 6 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 7.05 volts with a limiting current of 45 amperes.

9. Each battery shall be 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.