318030001 Start Key with Dual Battery Selector Compatible with Ryobi 40V Cordless Mowers,Fits for RY401014US & RY401015US 40 Volt 21 in Lawn Mower

What It Is

This is a replacement start key with an integrated dual battery selector switch, designed specifically for Ryobi 40V cordless mowers. It allows you to choose between two connected batteries to power the mower, and serves as the ignition key to start the machine.

Fitment & Compatibility

• Exact model fit: Compatible only with Ryobi RY401014US and RY401015US 40V 21-inch cordless mowers.
• Check your model number: Look on the mower deck or underside of the battery cover. If it’s not one of these two models, this key will not fit.
• OEM vs aftermarket: This is a third-party replacement, not an official Ryobi part. The connector and key slot are molded to match the original, but tolerances may vary.
• What to measure: The key slot width is approximately 0.5 inches, and the dual battery connector pins are spaced 0.2 inches apart. Compare with your original part before ordering.

Key Things to Know

• Installation difficulty: Easy – no tools required. Simply unplug the old key assembly and plug in the new one.
• Quality note: At $22.99, it’s cheaper than Ryobi’s OEM part (usually $30+). Users report it works as intended, but the plastic feels slightly less durable.
• Common gotcha: The dual battery selector function only works if both batteries are installed and charged. If one battery is dead, the mower may not start even with the key inserted.
• No warranty coverage: Using a third-party part may void your mower’s warranty. Keep your original key in case you need to return the mower for service.

Should You Buy It

Buy this if you own a Ryobi RY401014US or RY401015US mower and need a replacement start key with dual battery selector. It’s a budget-friendly, functional substitute for the OEM part, but check your model number first and be aware it may feel less robust than the original.