Last updated: May 21st, 2026

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The Optima Yellow Top AGM series is designed for vehicles that require exceptional power delivery and deep cycling capabilities. Known for its advanced AGM (Absorbent Glass Mat) technology, the Yellow Top series offers superior resistance to charge and discharge cycles, making it ideal for vehicles with start-stop systems, high electrical demands, and auxiliary power needs. Unlike conventional lead-acid batteries, AGM technology ensures a maintenance-free design, providing excellent vibration resistance, faster recharge times, and extended service life. Optima batteries are recognized for their durability and reliability, making them a top choice for both everyday drivers and professional users who require dependable performance under demanding conditions.

The Optima Yellow Top YT S 2,7J is a compact yet powerful 38Ah AGM battery, delivering a strong 460A cold cranking amperage to ensure reliable engine starts. Measuring 237mm in length, 129mm in width, and 227mm in height, this battery closely matches the B24 size specification, which is more commonly found in Asian vehicles. Unlike standard European batteries, the YT S 2,7J features a unique polarity configuration with the positive terminal positioned on the left (configuration 1), which differs from the more traditional right-positive setup found in many European models. This design feature makes it essential to check vehicle compatibility before installation.

Another notable feature of the YT S 2,7J is its terminal type. The battery is equipped with thinner, Japanese-style type 3 terminals, which differ from the more common European type 1 terminals. This makes it particularly well-suited for vehicles manufactured by Japanese and other Asian automakers, where these terminal specifications are standard. The presence of these specific connectors ensures a secure and efficient connection with compatible vehicles, reducing installation complexity.

The YT S 2,7J also features a B00 mounting system, which lacks the bottom securing ledges commonly found in B13 or B1 configurations. This means the battery must be secured using an alternative method, such as side clamps or top brackets, depending on the vehicle’s mounting requirements. The absence of a bottom mount ledge allows for more flexibility in installations where traditional mounting constraints might be an issue.

When compared to similar AGM batteries, the Optima Yellow Top YT S 2,7J competes closely with the GS Yuasa Auxiliary AGM HJ-S46B24R, which has slightly higher capacity at 45Ah but a lower starting power of 325A. Both batteries share nearly identical dimensions and mounting configurations, making them viable replacements for each other in compatible applications. However, the Optima Yellow Top offers superior cold cranking performance, making it a better choice for vehicles requiring higher starting power.

Overall, the Optima Yellow Top YT S 2,7J is a high-quality AGM battery designed for specialized automotive applications. With its compact size, left-positive terminal layout, Japanese-style connectors, and B00 mounting configuration, it is an excellent choice for vehicles requiring a reliable and maintenance-free power source. Its ability to withstand deep cycling, rapid recharging, and high vibration resistance ensures long-lasting performance, making it a valuable option for demanding automotive electrical systems.

Specifications

Battery specification
Brand	Optima
Series	Yellow Top AGM
Model	YT S 2,7J
Battery technology	AGM
Capacity	38 Ah
CCA (Cold Cranking Amps)	460 A
Length	237 mm
Width	129 mm
Height	227 mm
Battery layout	1 – positive on the left side
Terminal types	3
Base hold-down	B00

Similar batteries

Battery model	Capacity	CCA	Dimensions	Base hold-down
GS Yuasa Auxiliary AGM HJ-S46B24R	45 Ah	325 A	238x129x227 mm	B00
Optima Yellow Top AGM YT S 2,7J	38 Ah	460 A	237x129x227 mm	B00

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Frequently Asked Questions about the Optima YT S 2,7J car battery

What are the main features of the Optima Yellow Top AGM YT S 2.7J battery?

The Optima Yellow Top AGM YT S 2.7J battery offers premium deep-cycle and starting performance, maintenance-free operation, superior vibration resistance, and a longer lifespan due to its advanced AGM (Absorbent Glass Mat) technology. It is designed for vehicles with high electrical demands and frequent engine starts.

What applications is the Optima YT S 2.7J Yellow Top battery suitable for?

The Optima YT S 2.7J Yellow Top battery is ideal for use in cars, SUVs, RVs, boats, and vehicles with aftermarket electronics such as winches, audio systems, or advanced navigation. Its deep-cycle capability makes it perfect for dual-purpose applications that require both starting power and cycling.

How does the Optima Yellow Top AGM YT S 2.7J compare to standard lead-acid batteries?

The Optima Yellow Top AGM YT S 2.7J provides superior starting power, faster recharging, longer service life, and better resistance to vibration compared to conventional lead-acid batteries. Its AGM technology also means it is spill-proof and maintenance-free, making it safer and more reliable.

What are the technical specifications of the Optima YT S 2.7J battery?

The Optima YT S 2.7J has a voltage of 12V, a capacity of 48Ah, and a Cold Cranking Amps (CCA) rating of 660A. Its compact dimensions are 305mm x 173mm x 238mm, and it weighs approximately 19.7kg. The battery features a dual SAE and JIS terminal layout for versatile installation.

Can the Optima Yellow Top YT S 2.7J be mounted in any position?

Yes, thanks to its spill-proof AGM construction, the Optima Yellow Top YT S 2.7J can be safely mounted in virtually any position except upside down. This flexibility is especially useful in custom or tight installations.

Is the Optima Yellow Top AGM YT S 2.7J battery maintenance-free?

Yes, the Optima Yellow Top AGM YT S 2.7J is fully maintenance-free. There is no need to check electrolyte levels or add water, and the sealed design prevents leaks or spills, providing worry-free operation throughout its lifespan.

How long does the Optima YT S 2.7J typically last?

With proper care and charging, the Optima YT S 2.7J battery can last up to twice as long as conventional batteries, often providing reliable service for 3 to 5 years or more, depending on usage and environmental conditions.

What are the charging recommendations for the Optima Yellow Top YT S 2.7J?

It is recommended to use a smart charger compatible with AGM batteries to ensure optimal performance and longevity. Avoid overcharging and keep the battery fully charged when not in use, especially during long periods of inactivity.