RYOBI 40V 4.0Ah Replacement Battery RY40406 | High Capacity Li-Ion | Compatible with All RYOBI 40V Outdoor Tools

RYOBI 40V 4.0Ah RY40406 Battery

All-Day Power for Every Yard. Every Season.

Stop letting a dead battery cut your work short. This 40V 4.0Ah high-capacity replacement battery is built to keep your RYOBI 40V outdoor tools running at full power — through mowing, trimming, blowing, cutting, and everything in between.

4.0Ah High Capacity — Cover More, Charge Less

With 4,000mAh of lithium-ion capacity, this battery delivers extended runtime on a single charge — ideal for large yards and heavy-duty outdoor sessions. Spend more time working, less time waiting at the charger.

Fits Your Entire RYOBI 40V System

Designed as a direct drop-in replacement for the RYOBI RY40406, this battery is compatible with all RYOBI 40V tools and chargers across the full 40V platform — lawn mowers, string trimmers, leaf blowers, chainsaws, hedge trimmers, and 85+ products. One battery. Total versatility.

Smart BMS Protection — Every Charge, Every Use

Built-in Battery Management System (BMS) actively monitors and protects against:

• Overcharging
• Over-discharging
• Short circuits
• Overheating

Your tools and battery stay safe — from the first charge to the last.

Built-In LED Fuel Gauge

The onboard LED indicator shows remaining charge at a glance — so you always know how much runtime you have left before you head out to the yard.

Engineered for Outdoor Conditions

Rugged construction designed to handle vibration, dust, and the demands of real outdoor power equipment — not just light indoor use.

No Memory Effect — Top Up Anytime

Lithium-ion chemistry means no memory effect. Charge it after every use or only when it’s empty — either way, battery life won’t be affected.

Specifications

In the Box

• 1 × 40V 4.0Ah Li-Ion Replacement Battery

Key Features at a Glance

• 40V 4.0Ah High Capacity — extended runtime for large yard tasks
• Direct replacement for RYOBI RY40406 — no adapter needed
• Compatible with all RYOBI 40V tools and chargers (85+ products)
• Built-in BMS: overcharge, over-discharge, short circuit & overheat protection
• LED fuel gauge — check charge level at a glance
• No memory effect — charge anytime without reducing lifespan
• Rugged design built for outdoor power equipment conditions