RYOBI P108 18V 4.0Ah Replacement Battery | Compatible with All RYOBI 18V ONE+ Tools | High Capacity Li-Ion with Smart BMS Protection

Power up your RYOBI 18V ONE+ tools with this high-capacity 4.0Ah replacement battery. Compatible with 70+ tools, fast charge ready, built-in BMS protection and LED fuel gauge. Drop in and get to work.

One Battery. Every RYOBI 18V Tool. All Day Long.

Stop swapping batteries mid-job. This 18V 4.0Ah high-capacity replacement battery is built to keep your RYOBI ONE+ cordless tools running at full power — whether you’re drilling, cutting, trimming, or fastening from morning to night.

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4.0Ah High Capacity — More Runtime Per Charge

With 4,000mAh of lithium-ion capacity, this battery delivers extended runtime compared to standard 1.5Ah or 2.0Ah packs — fewer interruptions, fewer swaps, more work done. Ideal for homeowners and tradespeople who run their tools hard throughout the day.

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Compatible with Every RYOBI 18V ONE+ Tool

Designed as a direct drop-in replacement for the RYOBI P108, this battery fits all RYOBI 18V ONE+ cordless tools — drills, circular saws, reciprocating saws, trimmers, blowers, and 70+ more across the ONE+ platform. One battery. Your entire toolkit. Zero compromise.

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Full 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 protected — cycle after cycle, job after job.

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Fast Charge Ready — Back to Full in ~60 Minutes

Pair with a compatible RYOBI 18V charger and get a full charge in approximately 60 minutes. Minimal downtime, maximum productivity.

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Built-In LED Fuel Gauge

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

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Consistent Power from Start to Finish

Premium lithium-ion cells deliver stable voltage output throughout the entire discharge cycle — no slowdown, no drop-off. Full power from the first cut to the last.

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No Memory Effect — Charge Anytime

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

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Specifications

Feature	Details
Model	P108
Voltage	18V
Capacity	4.0Ah (4,000mAh)
Cell Type	Lithium-Ion
Charge Time	~60 minutes (with compatible charger)
Compatible Platform	All RYOBI 18V ONE+ Tools (70+ models)
Protection	Overcharge / Over-discharge / Short Circuit / Overheat
Charge Indicator	Built-in LED Fuel Gauge

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In the Box

• 1 × 18V 4.0Ah Li-Ion Replacement Battery (P108 Compatible)

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Key Features at a Glance

• 4.0Ah High Capacity — more runtime vs standard 1.5Ah / 2.0Ah packs
• Direct replacement for RYOBI P108 — plug in and go
• Compatible with all RYOBI 18V ONE+ tools and chargers (70+ models)
• Built-in BMS: overcharge, over-discharge, short circuit & overheat protection
• Fast charge compatible — full charge in ~60 minutes
• LED fuel gauge built in — always know your charge level
• No memory effect — charge anytime without reducing lifespan
• No adapter or modification required