When your ATV, motorcycle, scooter, or jet ski needs a fresh 12V battery, the main decision isn't brand loyalty-it's whether the replacement fits the tray and delivers enough starting power. The Mighty Max YTX4L-BS and the ExpertPower YTX5L-BS are two popular sealed lead-acid options, but they aren't interchangeable in every application.
Both batteries use 12V AGM technology and come ready to install, but they differ in capacity, size, and price.
Quick Verdict: If you want a lower-priced, slightly more compact battery for an everyday power sports vehicle, the Mighty Max YTX4L-BS at $19.99 is the practical pick. If you need more reserve capacity and stronger cold cranking output, the ExpertPower YTX5L-BS at $23.99 is worth the extra spend.
| Product | Listed Price | Amp Hours | CCA | Dimensions (L x W x H) |
|---|---|---|---|---|
| Mighty Max YTX4L-BS | $19.99 | 3 Ah | 50 | 4.40 x 2.75 x 3.42 in |
| ExpertPower YTX5L-BS | $23.99 | 5 Ah | 125 | 4.45 x 2.72 x 4.13 in |
Where each product wins
- Mighty Max YTX4L-BS - Sealed, pre-charged, and maintenance-free, with a one-year manufacturer warranty; the lighter case makes it easy to handle during installation.
- ExpertPower YTX5L-BS - Nuts and bolts are included for a simpler swap, and the battery is built to resist shock, vibration, chemicals, and heat thanks to its non-conductive ABS case.
Mighty Max YTX4L-BS
Choose the Mighty Max YTX4L-BS when your ride needs a straightforward replacement and the lower listed price appeals to you. The battery arrives sealed, pre-charged, and maintenance-free; it also carries a one-year manufacturer warranty and weighs just under 3 lbs. The tradeoff is its smaller power reserve compared to the ExpertPower, so it suits smaller vehicles or minimal electrical loads better than a machine with extra lights, heated grips, or a high-compression motor.
ExpertPower YTX5L-BS
Pick the ExpertPower YTX5L-BS when you want more starting and reserve capacity in your 12V system. It comes from the brand ExpertPower and includes nuts and bolts, so you don't have to hunt for hardware. The case is designed to hold up to shock, vibration, chemicals, and heat. If you run a motorcycle or ATV with a bigger engine or a few aftermarket accessories, this battery gives you headroom for tougher starts. The main limitation is the case size: at 4.45 x 2.72 x 4.13 inches, it is slightly longer and taller than the Mighty Max, so it may not fit every battery tray. Confirm clearances before you commit.
Final choice by use case - For a casual scooter, a small ATV, or a jet ski with modest starts, the Mighty Max YTX4L-BS gives you enough power for less money. For a motorcycle with a larger engine, a quad that sees regular use, or a power sports vehicle with added electronics, the ExpertPower YTX5L-BS's bigger reserve and included hardware make it the smarter spend.
