OPTIMA® RedTop®
Technical Specs
STARTING BATTERIES | ||||||
MODEL NUMBER | RT S 4.2 | RT F 4.2 | RT U 4.2 | RT U 3.7 | RT S 3.7 | RT S 2.1 |
PERFORMANCE | ||||||
Voltage (V) | 12 | 12 | 12 | 12 | 12 | 6 |
Cold Cranking Amps @ -18°C (A) | 815 | 815 | 815 | 730 | 730 | 800 |
Cranking Amps @ 0°C (A) | 1000 | 1000 | 1000 | 910 | 910 | 1000 |
Reserve Capacity (Minutes) | 100 | 100 | 100 | 90 | 90 | 100 |
Capacity (C/20 Rate)(Ah) | 50 | 50 | 50 | 44 | 44 | 50 |
Internal Resistance (ohms) | 0,003 | 0,003 | 0,003 | 0,003 | 0,003 | 0,0019 |
PHYSICAL SPECS | ||||||
Length (mm) | 254 | 254 | 254 | 237 | 237 | 254 |
Width (mm) | 172 | 185 | 172 | 172 | 172 | 83 |
Height (mm) | 200 | 184 | 200 | 197 | 197 | 200 |
Mimimum Weight (kg) | 17,2 | 17,5 | 17,6 | 15 | 14,4 | 8,4 |
Type Terminal | SAE | GM | Dual SAE | Dual SAE | SAE | SAE |
BCI Group | 34 & 34R | 78 | 34/78 | 75/35 | 25 & 35 | - |
Charging Info
All OPTIMA® RedTop Batteries
These batteries are designed for engine starting applications. They are NOT recommended or warranted for use in deep cycle applications.
Recommended charging information:
Alternator:
13.3 to 15.0 volts, no amperage limit.
Battery charger:
13.8 to 15.0 volts, 10 amps maximum, 6-12 hours approximate.
Rapid Recharge:
Maximum voltage 15.6 volts (regulated).
Maximum current: No limit as long as temperature < 50°C (125°F).
Maximum recharge time: Charge until current drops below 1 amp.
Float charge:
13.2 to 13.8 volts, 1 amp maximum current, time indefinite (at lower voltage).
All limits must be strictly adhered to.
Safety Information:
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 gasses to escape, resulting in premature failure. These gasses are flammable! You cannot replace water in sealed batteries that have been overcharged. Any battery that becomes very hot or makes a hissing sound while recharging should be disconnected immediately.
Failure to fully charge a battery can result in poor performance and a reduction in capacity
