How to Choose the Best 8S LiPo for 2025 editions Traxxas XRT Ultimate & X-Maxx Ultimate

The 2025 editions of the Traxxas XRT Ultimate and X-Maxx Ultimate are built for brutal 8S action. Many folks start off trying to wedge in a single 8S pack—but once you’ve fought with the tray clearance and wiring mess a few times, the smarter path becomes obvious: dual 4S. There’s a reason most seasoned drivers go with a pair of high-performance 4S batteries: better fit, easier wiring, balanced weight, and more flexible plug options.

CNHL’s 4S batteries weren’t just made to fit—they were built with setups like the 2025 editions of Traxxas X-Maxx Ultimate and XRT Ultimate in mind, where power and precision go hand in hand. If you’re chasing that tricky balance—something that pulls hard off the line but won’t quit after 10 minutes—you’ll want to check out these dual 4S options, your best bet is a dual 4S LiPo configuration using one of the CNHL batteries below.

Why Dual 4S Still Makes the Most Sense in 2025

Sure, 8S sounds convenient in theory. But in practice? A huge 8S brick often won’t even fit in your XRT or X-Maxx battery tray—let alone balance well on jumps or technical runs. That’s why Traxxas themselves stuck with dual-tray architecture. Running 4S packs in series doesn’t just fit better—it keeps the rig planted through jumps and tighter in the corners.

Top CNHL 4S Batteries for Ultimate 8S Builds

• CNHL Racing Series 9500mAh 14.8V 4S 90C (EC5) – Ask anyone who’s taken their XRT off a BMX ramp—this 9500mAh pack keeps coming up in conversations for a reason. Huge runtime, high punch, and cool running temps under pressure. If you want the longest runs without compromise, this is your pack.
• CNHL Racing Series 6200mAh 14.8V 4S 90C (EC5) – This pack’s a favorite for those who want punch off the line but still need enough runtime to finish a full session without swapping, giving you agility without giving up runtime.
• CNHL Racing Series 5200mAh 14.8V 4S 90C (EC5) – If your build’s already pushing the weight limit, this lighter 5200mAh pack lets you keep the speed without tipping the scale.
• CNHL G+Plus 6000mAh 14.8V 4S 70C (XT90) – If your rig’s already running XT90, this pack gives you solid acceleration without complicating the build—It hooks up clean, delivers consistent throttle response, and doesn’t throw off your handling—especially if you’re already wired for XT90.

Not sure which combo suits your driving style? We’ve broken them down by use case and tray fit in our detailed guide here: Best 8S Batteries for Traxxas XRT & X-Maxx Ultimate (2025).

Why We Recommend the CNHL 9500mAh 4S Above All

Power’s easy to find—what’s harder is finding a pack that doesn’t flinch mid-air when your ESC suddenly asks for everything. when the ESC demands everything. The 9500mAh 4S 90C delivers consistent punch across the board. Even when you’re flooring it out of a berm or mid-flip in the air, this pack doesn’t sag—Even deep into a session, this pack stays cool and steady—no thermal fade, no late-run drop-offs, and gives you that confidence when you're mid-air over a 10-foot jump.

In our community tests, this pack consistently gave users 25–30 minutes of real-world runtime with a wide mix of crawling, jumping, and full-throttle runs. Plus, the EC5 plug connects cleanly to the stock VXL-8s ESC with minimal resistance or wire hassle.

Pro Tip: Set Up Your Dual 4S Correctly

Think of them like twins—if one’s fresher or more worn than the other, you’ll feel it fast. Keep them identical, from charge cycles to connectors — treat them like a synced pair, not two random bricks. That’s key to a balanced 8S setup. And never mix different capacities or discharge rates. Treat them like twins—they work best when matched.

Frequently Asked Questions

Can I use one big 8S battery instead?

You technically could, but you’ll quickly find out why most drivers don’t. Fitment is a nightmare, balance is off, and wiring can get messy fast. Dual 4S just makes sense—You get a snug fit in the tray, no sketchy wiring runs, and a rig that stays composed even after a hard landing.

What’s better: EC5 or XT90?

Both are solid. If you're running stock Traxxas ESCs, EC5 is the no-brainer—just plug in and go. XT90 is great too, especially if you’ve already got FPV or other RC gear using it. CNHL gives you both options so you’re never locked in.

Can I mix and match 4S batteries?

Mixing different 4S packs might seem harmless—but it’s the fastest way to end up with overheating, imbalance, or worse. A mismatched set might not trip alarms right away—but over time, it’s what leads to puffed packs, cut-out ESCs, or worse. Always run matched pairs for 8S. It’s not just about performance—it’s about safety and reliability.

Where can I learn more about CNHL batteries for XRT/X-Maxx?

Check out our detailed comparison and buying guide right here: Best 8S Batteries for Traxxas XRT & X-Maxx Ultimate (2025).