Makita BL1815N 18V LXT Lithium‑Ion 1.5Ah Battery

The BL1815N is a compact, lightweight 18V LXT battery for fast turnarounds and minimal fatigue. It excels on short, frequent tasks where quick charging and agile tool handling matter more than extended runtime.

Key Specs

• Voltage/Platform: 18V LXT
• Capacity: 1.5Ah (approx. 27 Wh)
• Approx. Charge Time: ~15 minutes on Rapid Optimum chargers (DC18RC/DC18RD)
• Protection: Makita Star Protection Computer Controls (overload, over‑discharge, overheat)
• Weight/Size: Compact, under 1 lb for reduced wrist and overhead fatigue
• Fuel Gauge: No built‑in charge level indicator

When to Choose This Battery

• Punch lists and service calls where tools are on and off frequently
• Trim, cabinet hardware, electrical work, and light fastening
• Overhead drilling/fastening and tight spaces that benefit from a lighter pack
• As a fast‑charging backup to keep workflow moving between larger packs

Consider a Larger Capacity Instead If

• You run high‑draw tools (circular/reciprocating saws, grinders, planers)
• You need all‑day runtime with fewer battery swaps
• You power 36V (X2) tools that require two 18V batteries—this pack will work but runtime will be very short

Runtime Expectations

Capacity directly impacts runtime. As a rule of thumb, this 1.5Ah pack provides about 30% of the runtime of a 5.0Ah battery with the same tool and task.

Battery	Capacity	Relative Runtime vs 1.5Ah
BL1815N	1.5Ah	1.0×
BL1820B	2.0Ah	1.33×
BL1840B	4.0Ah	2.67×
BL1850B	5.0Ah	3.33×
BL1860B	6.0Ah	4.0×

Energy reference: ~27 Wh. As rough guidance, a 50 W load (light drilling/fastening) could see up to ~30 minutes of continuous run; a 300 W load (heavier cutting/grinding) could see ~5–6 minutes. Real‑world runtime varies with tool, material, and technique.

Compatibility

• Tools: Works with Makita 18V LXT tools. Star‑to‑Star pairing enables enhanced protection and communication.
• Chargers: Use Makita 18V LXT chargers (e.g., DC18RC/DC18RD). Not compatible with 12V CXT or 40V max XGT systems.
• Fit: Compact form factor fits standard LXT battery mounts; check tool clearance if a shroud or cage surrounds the battery port.

Charging and Care

• Charge on a Makita Rapid Optimum charger shortly before use for best readiness.
• Allow a hot or cold battery to reach room temperature before charging.
• Storage: Cool, dry location at ~40–60% charge; avoid leaving in hot vehicles.
• Rotation: Cycle among two or more packs to reduce heat stress and extend life.
• Maintenance: Keep battery contacts clean and vents unobstructed.

Safety Notes

• Use only with compatible Makita tools/chargers. Do not open, puncture, or modify the pack.
• Stop using if the battery is cracked, swollen, or excessively hot. Recycle through approved channels.
• Avoid water immersion; dry the pack and inspect before reuse if exposed to moisture.

Alternatives and Complements

• Need a compact pack with more runtime: BL1820B (2.0Ah) adds ~33% more runtime and includes a fuel gauge.
• General purpose, fewer swaps: BL1850B (5.0Ah) balances weight and all‑day productivity.
• Maximum runtime: BL1860B (6.0Ah) for high‑draw tools and longer sessions.

FAQ

Does the BL1815N have a charge level indicator?

No. If you want an on‑pack fuel gauge, look for “B” models like BL1820B/BL1850B/BL1860B.

Will it work with my older 18V LXT tool?

In most cases, yes. It is backward compatible with 18V LXT tools. Pairing with tools that also have Star Protection enables enhanced communication and safety.

Can I use it on a dual‑port charger (DC18RD)?

Yes. It charges normally on Makita Rapid Optimum dual‑port chargers.

Is it okay to leave the battery on the charger?

Makita chargers manage charge and maintenance, but for longest life, remove the battery after it’s fully charged and store it in a cool, dry place.

How does cold weather affect performance?

Expect reduced runtime below 32°F (0°C). Warm the pack to room temperature for best performance and to enable normal charging.