Ryobi ONE+ 18V Battery - 4.0Ah - RB18L40

The Ryobi 18V 4.0Ah Lithium+ battery is designed to provide consistent power, longer run-times, an...

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OnBuy.comRyobi Battery Rb18l40 One+ 4.0Ah Li-Ion 18V Heavy Duty Powerful Lightweight 4892210184030
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£69.95
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B&QB&Q - One+ 4.0Ah Lithium+ Battery 18V Rb18L40
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£70.00
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Product Information

Full details

The Ryobi 18V 4.0Ah Lithium+ battery is an essential power solution for DIY enthusiasts and homeowners invested in the Ryobi ONE+ tool ecosystem, offering extended runtime and high-performance energy delivery for demanding tasks. While this battery provides superior longevity compared to entry-level packs, its increased capacity results in a slightly heavier tool profile, which may impact user fatigue during overhead or prolonged continuous use.

All features

Model Part NumberRB18L40
BrandRyobi

Extended Product Information

FAQs

Will this battery work with older Ryobi blue tools?

Yes, this battery is backward compatible with the entire Ryobi 18V ONE+ range, regardless of the tool's age or color.

How long does it take to charge a 4.0Ah battery?

Charging time varies depending on the specific model of your Ryobi charger, typically ranging from 60 to 120 minutes.

Can I leave the battery on the charger after it is full?

Most modern Ryobi chargers are designed to stop charging once the battery is full, but it is best practice to remove it after charging is complete.

Does the temperature affect battery performance?

Yes, extreme cold or heat can temporarily reduce runtime and performance. Always store and charge at room temperature when possible.

What should I do if the battery gets wet?

Wipe off all external moisture immediately and allow it to air dry completely in a ventilated area before attempting to charge or use it.

Troubleshooting

Battery will not charge when placed in the charger.

Ensure the battery is fully seated in the charger and check that the charger is plugged into a functioning power outlet. Inspect contacts for debris.

Battery stops working under heavy load.

The internal thermal protection may have triggered. Remove the battery, allow it to cool for 15 minutes, and try again.

Tool power feels inconsistent or weak.

Check the battery fuel gauge. If the level is low, fully recharge the battery and clean the electrical terminals with a dry cloth.

Pros and Cons

Pros

  • Extended runtime for heavy-duty tasks
  • IntelliCell technology improves cell safety and lifespan
  • Durable housing protects against job site accidents
  • Compatible with all Ryobi 18V ONE+ tools
  • Quick access to power status via fuel gauge

Cons

  • Heavier than smaller capacity battery models
  • Requires more time to charge fully than 1.5Ah or 2.0Ah units
  • Size can make some tools feel bulky in tight spaces

Setup, Compatibility & Care

To begin, simply slide the battery into the base of any Ryobi 18V ONE+ power tool until it clicks into place. It is compatible with all Ryobi 18V chargers currently on the market. For care, store the battery in a cool, dry environment away from extreme heat or freezing temperatures, as these conditions degrade chemical capacity over time. Periodically wipe the metal contact points with a clean, dry cloth to ensure a stable electrical connection. If the battery will not be used for an extended period, it is recommended to store it at approximately 50% charge to preserve long-term health.

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