ExpertPower YTX4L-BS 12V 4Ah AGM Motorcycle Battery — 120 CCA, Maintenance-Free Sealed Unit

ExpertPower YTX4L-BS is a sealed 12V AGM motorcycle battery delivering 4Ah capacity and 120 CCA in a compact, maintenance-free package.

Designed as a higher-capacity replacement for small-displacement bikes and powersports vehicles, this ExpertPower unit combines absorbed glass mat (AGM) technology with a sealed construction to offer reliable starting power, vibration resistance and zero refilling maintenance. It’s intended as a direct-fit swap for common YTX4L-BS and equivalent models, giving you a straightforward upgrade when your stock battery no longer holds a dependable charge.

How much extra runtime does this 4Ah battery provide compared with smaller cells?

The 4Ah rating means this battery stores more energy than many 3Ah alternatives, translating to longer standby time and more available power for accessories between charges. That increased capacity is particularly useful for vehicles that sit unused for longer stretches or that run additional electrical loads.

• 4 ampere-hours of stored energy for extended idle current support
• Better reserve for lights, alarms and charging small accessories
• Helps reduce the frequency of recharge cycles compared with lower-capacity cells

Will this battery start my bike in cold weather?

With a Cold Cranking Amp rating of 120 CCA, the battery provides robust initial current to help turn over small motorcycle and scooter engines in cooler conditions. While performance depends on engine size and temperature extremes, 120 CCA is competitive for 50cc–125cc class machines and many ATVs and dirt bikes.

• 120 CCA for improved ignition under cold starts
• Reliable short-burst current to crank small-displacement engines
• AGM design preserves performance in varying temperatures

Is this an easy drop-in replacement for my current battery model?

Yes — the YTX4L-BS form factor is designed as a direct replacement for several OEM part numbers including YT4L, GTX4L and GT4L. Its compact footprint fits many small motorcycles, scooters and ATVs, but you should always measure your battery compartment and confirm terminal orientation before purchasing.

• Dimensions approximately 4.45" L x 2.76" W x 3.39" H
• Compatible with many CRF110, Grom and similar models; check fitment for 50cc–100cc machines
• Top-post terminals and standard YTX4L-BS layout for simple swap-in

What are the maintenance and safety advantages of AGM construction?

This battery uses absorbed glass mat technology to trap the electrolyte inside the plates, which creates a sealed, spill-proof unit that resists vibration and reduces the risk of leakage. Because it is fully sealed and rechargeable, there’s no need to add water, making it safer and lower-maintenance for enclosed battery boxes and passenger compartments.

• Sealed design prevents acid spills and reduces corrosion risk
• Vibration-resistant construction suited for off-road and daily riding
• Maintenance-free—no watering or periodic electrolyte checks required

Who is this battery for: Riders, owners and mechanics who need a compact, higher-capacity replacement battery for small motorcycles, scooters, ATVs and dirt bikes will appreciate the ExpertPower YTX4L-BS. It’s a good choice if you want a sealed, rechargeable battery that provides dependable cranking power, simpler upkeep and straightforward compatibility with common YTX4L-style applications. Always verify dimensions, terminal placement and polarity to ensure a correct fit for your specific vehicle.