Optima Redtop
Sealed maintenance-free pure-lead spiral-cell battery | electrolyte absorbed (AGM)

Optima RedtopHighest starting performance

Whenever starting power is a top priority, e.g. in heavy commercial agricultural and construction machinery. Does not lose its starting ability even during long periods of downtime. Perfect for emergency vehicles or generators.

Our recommendation for American vehicles if you want a sealed battery.

Features

  • Easy to install

    Your advantage: With the right dimensions, it fits exactly in your US vehicle.

  • Connect quickly

    Your advantage: Can be easily connected to the cables of common US models with US front pole with internal thread or A-cone poleHighest

  • Highest starting currents.

    Because this AGM battery has a particularly large reaction surface due to the tightly wound grids, it charges well and has a high cold start capability.
    Your advantage: Even if you have a lot of consumers installed, which eat up the battery, it brings enough power to start.

Characteristics

  • Very high starting performance. Wound pure-lead plates for larger plate surface and less plate spacing.
  • Very cycle resistant. Tolerates deep discharging by power-hungry consumers when the engine is switched off.
  • Good vibration resistance and durability. Pressed, wound plates protect the active material.
  • For extreme conditions.
  • Sealed pure-lead spiral-cell battery with electrolyte fixed in glass fibre mats (AGM).
  • Compact dimensions.
  • 6-volt and 12-volt versions.
  • Sealed maintenance-free and leak-proof.
Recycling efficiency 95 %
Maximum tipping angle 90º

All Types

Optima Redtop

Battery Volt Capacity CCA Length mm Width mm Height mm Pos. of terminal Terminal
RTC-4.2Li1250 AH (c20)815 A (EN)25417520011more
product image Starter Battery Optima Redtop RTC-4.2L

RTC-4.2L

Japan-Code:{jpn}

RTC-4.2L

Position of Terminal:1
Volt:12
Terminal:1
Capacity:50 AH (c20)
Base plate:none
Cold Cranking Ampere:815 A (EN)
Size:254 x 175 x 200 mm


Kasten: RTC-4.2L
Where can I buy this battery?

Dealer online shop

Buy online

Locally

Dealer locator
Download datasheet
RTS-4.2Li1250 AH (c20)815 A (EN)25417520011more
product image Starter Battery Optima Redtop RTS-4.2L

RTS-4.2L

Japan-Code:{jpn}

RTS-4.2L

Position of Terminal:1
Volt:12
Terminal:1
Capacity:50 AH (c20)
Base plate:none
Cold Cranking Ampere:815 A (EN)
Size:254 x 175 x 200 mm


Kasten: RTS-4.2L
Where can I buy this battery?

Dealer online shop

Buy online

Locally

Dealer locator
Download datasheet
RTR-4.2Li1250 AH (c20)815 A (EN)25417520001more
product image Starter Battery Optima Redtop RTR-4.2L

RTR-4.2L

Japan-Code:{jpn}

RTR-4.2L

Position of Terminal:0
Volt:12
Terminal:1
Capacity:50 AH (c20)
Base plate:B01
Cold Cranking Ampere:815 A (EN)
Size:254 x 175 x 200 mm


Kasten: RTR-4.2L
Where can I buy this battery?

Dealer online shop

Buy online

Locally

Dealer locator
Download datasheet
RTU-4.2Li1250 AH (c20)815 A (EN)25417520011 und USmore
product image Starter Battery Optima Redtop RTU-4.2L

RTU-4.2L

Japan-Code:{jpn}

RTU-4.2L

Position of Terminal:1
Volt:12
Terminal:1 und US
Capacity:50 AH (c20)
Base plate:none
Cold Cranking Ampere:815 A (EN)
Size:254 x 175 x 200 mm


Kasten: RTU-4.2L
Where can I buy this battery?

Dealer online shop

Buy online

Locally

Dealer locator
Download datasheet
RTF-4.2Li1250 AH (c20)815 A (EN)2541851841USmore
product image Starter Battery Optima Redtop RTF-4.2L

RTF-4.2L

Japan-Code:{jpn}

RTF-4.2L

Position of Terminal:1
Volt:12
Terminal:US
Capacity:50 AH (c20)
Base plate:none
Cold Cranking Ampere:815 A (EN)
Size:254 x 185 x 184 mm


Kasten: RTF-4.2L
Where can I buy this battery?

Dealer online shop

Buy online

Locally

Dealer locator
Download datasheet
RT6V-2.1Li650 AH (c20)815 A (EN)2549020301 und USmore
product image Starter Battery Optima Redtop RT6V-2.1L

RT6V-2.1L

Japan-Code:{jpn}

RT6V-2.1L

Position of Terminal:0
Volt:6
Terminal:1 und US
Capacity:50 AH (c20)
Base plate:B06
Cold Cranking Ampere:815 A (EN)
Size:254 x 90 x 203 mm


Kasten: RT6V-2.1L
Where can I buy this battery?

Dealer online shop

Buy online

Locally

Dealer locator
Download datasheet
RTS-3.7Li1244 AH (c20)730 A (EN)23717119711more
product image Starter Battery Optima Redtop RTS-3.7L

RTS-3.7L

Japan-Code:{jpn}

RTS-3.7L

Position of Terminal:1
Volt:12
Terminal:1
Capacity:44 AH (c20)
Base plate:B01
Cold Cranking Ampere:730 A (EN)
Size:237 x 171 x 197 mm


Kasten: RTS-3.7L
Where can I buy this battery?

Dealer online shop

Buy online

Locally

Dealer locator
Download datasheet
RTU-3.7Li1244 AH (c20)730 A (EN)23717119711 und USmore
product image Starter Battery Optima Redtop RTU-3.7L

RTU-3.7L

Japan-Code:{jpn}

RTU-3.7L

Position of Terminal:1
Volt:12
Terminal:1 und US
Capacity:44 AH (c20)
Base plate:none
Cold Cranking Ampere:730 A (EN)
Size:237 x 171 x 197 mm


Kasten: RTU-3.7L
Where can I buy this battery?

Dealer online shop

Buy online

Locally

Dealer locator
Download datasheet
RTR-3.7Li1244 AH (c20)730 A (EN)23717119701more
product image Starter Battery Optima Redtop RTR-3.7L

RTR-3.7L

Japan-Code:{jpn}

RTR-3.7L

Position of Terminal:0
Volt:12
Terminal:1
Capacity:44 AH (c20)
Base plate:none
Cold Cranking Ampere:730 A (EN)
Size:237 x 171 x 197 mm


Kasten: RTR-3.7L
Where can I buy this battery?

Dealer online shop

Buy online

Locally

Dealer locator
Download datasheet

Accessories
Charger

DEFA SmartCharge


Compact design for convenient charging of 12 volt batteries.


See product

Fronius Acctiva


Charge starter batteries professionally and supply consumers and on-board electronics.


See product
What is an AGM battery?
FIBERGLASS FLEECE
ABSOLUTELY MAINTENANCE-FREE
LEAK PROOF
What is the point of vibration-proofing a starter battery?
Especially in trucks and other high-displacement commercial vehicles with diesel engines, there are strong vibrations that cause the battery to age prematurely. Our truck batteries in SHD versions are vibration resistant according to V3, like the intAct …
Our absolutely maintenance-free motorcycle batteries
intAct Bike-Power AGM, intAct Bike-Power SLA, intAct Bike-Power GEL, intAct Bike-Power HVT and intAct Bike-Power GEL HVT-HD are valve regulated lead-acid batteries or VRLA batteries (VRLA=Valve Regulated Lead-Acid). VRLA batteries produce much less gas …
What does absolutely maintenance-free mean?
Absolutely maintenance-free batteries are valve-regulated lead-acid batteries or VRLA batteries (VRLA = Valve Regulated Lead-Acid) that are sealed at the factory. Here, significantly less gas is produced than in wet batteries. The gas produced remains …
Why does this battery have such a good current draw?
Due to the AGM technology, this battery absorbs the current particularly well, i.e. it recharges faster than a conventional wet battery and you can charge it with a higher charging current or a more powerful charger, like the ? This characteristic comes …
What are start-stop batteries?
The EFB (Enhanced Flooded Battery) was developed for start-stop vehicles. This further development of the wet battery is significantly more cycle resistant, like the intAct Start-Stop-Power EFB. Because of the good current reserve, AGM batteries are also …
Do I need an EFB or AGM start-stop battery?
If an EFB start-stop battery is installed at the factory, it can be replaced again with an EFB start-stop battery. An upgrade to AGM is always possible. If an AGM start-stop battery is installed at the factory, it may only be replaced with an AGM start-stop …
Also important for starter batteries: the consumers
Even before the engine is started, the starter battery has to do a lot and supply standard equipment such as the lighting system. This draws current from the battery, which is no longer available for starting. Nowadays, there are also a number of consumers …
Causal research for better purchasing decisions
Batteries age and fail. Sometimes it happens faster than you planned. If you know the cause of premature aging, you have a chance to make a more appropriate choice now: A battery that fits your technical requirements, intended use, and individual habits …
Check battery externally before charging
If the battery box is damaged or deformed, replace the battery. Clean dirty terminals with a wire brush. Remove oils, fluids or other deposits. For batteries with plugs, check fluid level and refill to MAX with distilled water if necessary.
Always choose a battery that suits your individual requirements
Each battery technology has particular strengths, but also weaknesses. Depending on the requirements your battery has to meet in the respective application, or which properties you want, some battery technologies are more suitable or less suitable. It is important to weigh up the properties.
Charge filled and charged battery before installation.
A battery that is not fully charged when installed will not reach its full capacity in the future and will have a significantly shortened service life. Even factory-filled and charged batteries can lose charge during storage. We recommend that you also …
Batteries without vent hose
Only conventional, wet batteries need a vent hose, because they gas strongly during operation. The resulting steam can escape through the openings in the plugs. To prevent the vapour from damaging the vehicle, conventional batteries are vented to the …
What the battery does
In a nutshell, the battery generates electricity, which it delivers to the consumers. It is charged and is ready again. So far, so good. Meanwhile, a bit of chemistry happens inside the battery. Current flow In principle, current flows between a positive …
Pay attention to the state of charge
We recommend: Check the charge level every 2 - 3 months if ... ... the vehicle is often left unused. ... you drive a lot of short distances. ... many consumers are installed. ... it is cold. ... in start-stop systems the engine does not switch off as …
Do I need a start-stop battery or a normal one?
In start-stop vehicles, the engine stops every time the vehicle is in neutral. This saves petrol and reduces air pollution. However, this means an extremely high load for the battery. It has to start much more often, i.e. deliver high currents, than a …

What is a starter battery?

A battery that is charged by the alternator and starts the vehicle. For this purpose, the starter motor requires a lot of current for a short time. In addition to the cold start capacity (CCA), which indicates how much current the battery can ideally supply, the properties of a battery influence how reliably it can provide this starting power. A battery with very good charging properties recharges more quickly, for example, which benefits vehicles in city traffic in particular. It also supplies the consumers in vehicles without an additional back-up battery or supply battery. The more electrical consumers are installed at the factory or retrofitted, the more capacity is required to supply them when the vehicle is idling or at an engine stop and still reliably restart the vehicle.

Commissioning

A battery that is not fully charged when installed will not reach its full capacity in the future and will have a significantly shortened service life.

Even factory-filled and charged batteries can lose charge during storage. We recommend that you also fully charge them before installation.

You can find out how to do this in our step-by-step guide to charging your battery.

Maintenance and Care

Absolutely maintenance-free batteries are valve-regulated lead-acid batteries or VRLA batteries (VRLA = Valve Regulated Lead-Acid) that are sealed at the factory. Here, significantly less gas is produced than in wet batteries. The gas produced remains in the circuit of the battery due to gas recombination. As a result, these batteries lose significantly less liquid. They do not need to be topped up, and it is not even possible to do so, as they cannot be opened again without damage.

For which applications is the Optima Redtop suitable?

car
car, passenger car, cars, automobiles, vans, panel van
Bus
Bus, Omnibus, Autobus
Wohnmobile
Wohnmobile, Caravan, Motorcaravan, Motorhome, Campingbus, Reisemobil, Alkoven, Campingfahrzeuge
Lkw
Lkw, Lastkraftwagen, Lastwagen, Lastauto, Laster, Lastzug, Truck,
Construction machinery
Compatible with construction machinery such as wheel loaders, tracked loaders, excavators and graders.
Tractors
For tractors, tractors, axle tractors, tractors, bullodg, tractor tractors and implement carriers.
Marine
Boats, ships, yachts