Optima® YellowTop 4.2 S
Optima Yellow Top 4.2LS
These batteries are designed for starting and deep cycling applications and
for use in vehicles with large accessory loads.
Battery Model: 4,2
Part Number: 8012-254
Nominal Voltage: 12 volts
NSN: 6140 01 457 5392
High power, dual purpose engine start and deep cycle, sealed lead acid battery
Warranty: 1 Year Manufacturers
Plate Design: High purity lead-tin alloy. Wound cell configuration utilizing proprietary SPIRALCELL® technology.
Electrolyte: Sulfuric acid, H2SO4
Case: Light Gray
Cover: “OPTIMA“ Yellow
Group Size: BCI: 34
Length: 10" 254mm
Width: 6.875" 175mm
Height: 7.813" 200mm (height at the top of the terminals)
Weight: 42.9lb 19.5kg
Terminal Configuration: SAE / BCI automotive.
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)
CCA (EN -18°C): 765amps
MCA (BCI 0°C): 870 amps
The following charging methods are recommended to ensure a long battery life: (Always use a voltage regulated charger with voltage limits set as described below.)
Model: YT S 4,2
These batteries are designed for starting and deep cycling applications and for use in vehicles with large accessory loads.
Recommended Charging Information:
13.65 to 15.0 volts
Battery Charger (Constant Voltage):
13.8 to 15.0 volts; 10 amps maximum; 6-12 hours approximate
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 5
0°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 Approx: time to charge to 90% charge
100 amps 35 minutes
50 amps 75 minutes
25 amps 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
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.
Shipping and Transportation Information:
OPTIMA batteries can be shipped by AIR. The battery is nonspillable and is tested according to ICAO Technical Instructions DOC. 9284-AN/905 to meet the requirements of Packing Instructions No. 806 and is classified as non-regulated by IATA Special Provision A-48 and A-67 for UN2800. Terminals must be protected from short circuit.