Aki Mobil Aki Optima Kuning Optima Batteries Yellow Top D34 Original
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Battery Model: YT S 4,2
Part Number: 812 254 000 888 2
Nominal Voltage: 12 volts
NSN: 6140 01 457 5392
Description: High power, dual purpose engine start and deep
cycle, sealed lead acid battery
Battery Model: YT S 4,2
Part Number: 812 254 000 888 2
Nominal Voltage: 12 volts
NSN: 6140 01 457 5392
Description: High power, dual purpose engine start and deep
cycle, sealed lead acid battery
Physical Characteristics:
Plate Design: High purity lead-tin alloy. Wound cell configuration utilizing proprietary
SPIRALCELL® technology.
Electrolyte: Sulfuric acid, H2SO4
Case: Polypropylene
Color: Case: Light Gray
Cover: “OPTIMA“ Yellow
Group Size: BCI: 34
Length: 254 mm
Width: 175 mm
Height:200 mm (height at the top of the terminals)
Weight:19.5 kg
Performance Data:
Open Circuit Voltage (fully charged): 13.1 volts
Internal Resistance (fully charged): 0.0028 ohms
Capacity: 55 Ah (C/20)
Reserve Capacity: BCI: 120 minutes
(25 amp discharge, 80°F (26.7°C), to 10.5 volts cut-off)
Power:
CCA (EN -18°C): 765 amps
MCA (BCI 0°C): 870 amps
Recommended Charging:
Alternator: 13.65 to 15.0 volts
Battery Charger (Constant Voltage): 13.8 to 15.0 volts; 10 amps maximum; 6-12 hours approximate
Float Charge: 13.2 to 13.8 volts; 1 amp maximum (indefinite time at lower
voltages)
Rapid Recharge:
(Constant voltage charger)
Maximum voltage 15.6 volts. No current limit as long as battery
temperature remains below 50°C (125°F). Charge until
current drops below 1 amp.
Cyclic or Series String Applications: 14.7 volts. No current limit as long as battery temperature
remains below 50°C (125°F). When current falls below 1 amp,
finish with 2 amp constant current for 1 hour.
All limits must be strictly adhered to.
Recharge Time: (example assuming 100% discharge – 10.5 volts)
Current
100 amps
50 amps
25 amps
Approx. time to 90% charge
35 minutes
75 minutes
140 minutes
Recharge time will vary according to temperature and charger characteristics. When using
Constant Voltage chargers, amperage will taper down as the battery becomes recharged. When
amperage drops below 1 amp, the battery will be close to a full state charge.
(All charge recommendations assume an average room temperature of 25°C, 77°F)
Always wear safety glasses when working with batteries.
Always use a voltage regulated battery charger with limits set to the above ratings. Overcharging
can cause the safety valves to open and battery gases to escape, causing premature end of life.
These gases are flammable! You cannot replace water in sealed batteries that have been
overcharged. Any battery that becomes very hot while charging should be disconnected
immediately.
Not fully charging a battery can result in poor performance and a reduction in capacity.
