【Optima Yellowtop D1000U (YT U4.2L)｜Battery for Car Audio & High-Electrical Vehicles】

When more devices that use a vehicle’s electricity—such as car audio and security systems—are installed, the battery is required not only to handle starting, but also to withstand repeated charge and discharge cycles.

Optima Yellowtop is a deep-cycle battery designed for applications that repeatedly cycle deep discharge and recharge. With Optima’s unique spiral-cell technology, it helps maintain voltage and has low self-discharge, making it suitable for vehicles that aren’t driven every day as well as those stored for long periods.

In vehicles equipped with power-hungry equipment such as large car audio systems, winches, and engine heaters, the stability of the power supply can affect usability and how the equipment operates. In car audio, you may even notice changes after replacing the battery—such as stronger mid/low-range punch, a smooth “sparkle” in the high end, and better cohesion in the sound.

Of course, replacing the battery doesn’t necessarily mean the sound will dramatically change. The outcome varies depending on the vehicle’s charging condition, the existing power environment, and the compatibility with the entire audio system. That’s why it’s important to choose not only by capacity and terminal shape, but also by confirming how the vehicle is used and what equipment is installed.

At LOGON, we consider together whether the battery will suit your vehicle while checking your power environment—including your car audio and security systems. If I were choosing, even for the purpose of improving sound quality, I would first check the current battery condition and the charging system before deciding. Since you’re replacing it, you’d want it to be something you can use long-term with peace of mind.

Recommended for These Types of Cars

• People who want to review/improve the power environment for their car audio
• Vehicles equipped with large audio systems
• Vehicles with devices that use standby power, such as security systems
• Cars driven only a few times per month
• American cars or vehicles with high-output engines
• Vehicles that use many electrical accessories, such as winches and engine heaters
• People who want to change from a standard starter battery to a type that’s stronger against charge/discharge cycles

Main Specifications & Performance

【Basic Information】

• Product name: Optima Yellowtop D1000U
• Model notation: YT U4.2L
• Type: Deep-cycle battery
• Maintenance-free

【Performance & Features】

• Designed to handle repeated deep discharge and recharge
• Usable as a starter battery as well
• Low self-discharge rate design
• Optima’s unique spiral-cell technology
• Reduced internal resistance for quickly releasing energy

【Terminals & Dimensions】

• Terminal standard: R terminals / Large pole
• Side terminal: Yes
• Width: 254 mm
• Thickness: 172 mm
• Box height: 172 mm
• Total height: 199 mm

【Capacity】

• 20-hour rate (EN) / BCI: 55Ah
• BCI standard: G34 / 78

*Even if the terminal shape and size match, compatibility may require confirmation depending on the vehicle’s mounting method and the charging system. When considering a replacement, please check the vehicle model, model number, and information about the currently installed battery before consulting us.

**When you optimize the power supply, the way you use your car—and how you enjoy the sound—can change.**Let’s think together about a configuration that suits your vehicle, including the combinations with your car audio and electrical accessories.