40v 7500mAh OP4026A Battery Replacement for Ryobi 40v Battery Compatible with Ryobi 40 Volt Lithium OP4026A OP40601 OP4050A OP4040 OP4075A Compatible with Batteries 40V Power Tools

What It Is

This is an aftermarket 40V 7.5Ah lithium-ion battery designed as a direct replacement for the Ryobi OP4026A and other compatible Ryobi 40V batteries. It powers any Ryobi 40V tool or mower—including brushless mowers, trimmers, blowers, and chainsaws—for longer runtimes than the standard 4.0Ah or 5.0Ah packs.

Fitment & Compatibility

What to check before buying:

• Battery model compatibility: Fits Ryobi 40V batteries with part numbers OP4026A, OP40601, OP4050A, OP4040, and OP4075A. Also fits any Ryobi 40V tool or charger that accepts those packs (e.g., RY40-series mowers, RY40500, RY40600, RY40700 trimmers/blowers).
• Physical dimensions: Same size and slide-mount interface as OEM Ryobi 40V batteries. Should click into all standard Ryobi 40V chargers and tools.
• Voltage & capacity: 40V nominal, 7.5Ah (270Wh). Higher capacity means longer run time but also heavier (approx. 2.5 lbs vs. 1.8 lbs for a 4.0Ah).
• Aftermarket note: Not made by Ryobi—no OEM warranty or guarantee of fit for every odd-shaped tool. Test with your specific tool/charger before relying on it for a full job.

Key Things to Know

• Quality & safety: Look for UL or CE certification markings on the battery. Cheaper no-name packs may lack overcharge/over-discharge protection. This one has decent reviews but always inspect for swelling or heat during first charge.
• Installation: Zero difficulty—slides in like any Ryobi battery. No tools, no wiring.
• Common gotcha: Some users report the battery doesn’t fully seat in older Ryobi chargers (e.g., 40V “silver” chargers) due to slightly thicker casing. Try before you buy if using an older charger.
• Run time vs. weight: 7.5Ah gives ~50% more runtime than a 5.0Ah pack, but adds noticeable weight on a mower. Fine for a trimmer/blower; can make a push mower front-heavy.

Should You Buy It

Buy this if you already own Ryobi 40V tools and want a high-capacity backup for long jobs (e.g., mowing a large lawn or trimming all day) without paying the OEM price. Skip it if you need guaranteed fit with older Ryobi chargers or require OEM safety certifications for heavy commercial use.