A-A-50611 Battery, Storage (Portable, Sealed, Maintenance-Free, Lead-Acid) 6 Volt, 50 Ampere-Hour, Type 6V-S-50 AhThis Commercial Item Description covers a 6 volt (normal and reversed), 50 ampere-hour sealed, valve-regulated lead-acid (VRLA), storage battery with a low rated and deep discharge duty cycle for use on Naval surface ships.

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A-A-50611

Salient characteristics. The product shall be a 6 volt (normal and reversed), 50 ampere-hour sealed lead-acid storage battery, meeting the requirements specified below.

1. Dimensions. The maximum dimensions for the battery shall be:

length - 9.1 inches

width - 7.1 inches

height - 9.4 inches

2. Weight. The battery weight shall be 44 pounds maximum when filled.

3. Terminals. The terminals shall be Battery Council International Type V supplied with wingnuts and capable of receiving a round end lug accepting an AWG #2 cable.

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 amp (or 10 hour) rate shall be a minimum of 50 ampere-hours with a cut-off voltage of 5.25 volts in the temperature range of 20^o to 27^oC.

6. Reverse capacity. The battery shall deliver 25 amperes for a minimum of 60 minutes 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 (50 ampere-hours) 28 days after charge termination when discharged at the 10 hour rate.

8. 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.