Makita 191L29-0 40V MAX XGT Lithium-Ion 8.0Ah

Makita 191L29-0 (BL4080F) 40V max XGT Lithium‑Ion 8.0Ah Battery

The Makita 191L29-0 8.0Ah XGT battery is the high‑capacity pack for professionals who push 40V max tools hard. It prioritizes runtime and sustained output on heavy loads such as rotary hammers, large circular saws, chain saws, and outdoor power equipment.

At a glance

Platform	Makita XGT 40V max (36V nominal)
Capacity	8.0Ah (approx. 288Wh)
Charge time	~76 minutes on DC40RA Rapid Charger (fan‑cooled)
Compatibility	All XGT 40V max tools; also serves as one of two packs on 80V max XGT tools. Not compatible with LXT/CXT tools.
Battery features	On‑board fuel gauge, digital communication with tool/charger, robust housing with shock absorption

Note: 40V max is 36V nominal. Actual runtime and charge time vary by tool, task, and temperature.

When to choose this battery

• Use if you need maximum runtime on high‑draw tools (e.g., SDS‑Max hammers, 7‑1/4 in. circular or rear‑handle saws, 16–18 in. chain saws, power cutters).
• Use for multi‑shift or remote work where swapping/charging packs frequently isn’t practical.
• Avoid for overhead or precision work where weight and tool balance are critical—choose a 2.5–5.0Ah XGT pack instead.

Runtime expectations

Capacity scales runtime roughly in proportion (under similar load):

2.5Ah (BL4025)	~62% of 4.0Ah runtime
4.0Ah (BL4040)	Baseline (100%)
5.0Ah (BL4050F)	~125% of 4.0Ah runtime
8.0Ah (BL4080F)	~200% of 4.0Ah runtime

Heavy, continuous loads benefit most because the higher capacity helps sustain output with less voltage sag.

Charging and care

• Let the pack cool to near room temperature after hard use before charging for fastest recovery.
• Use the XGT Rapid Charger (DC40RA) for best results; keep charger vents clear for active cooling.
• Wipe battery contacts periodically to maintain efficient charging and power delivery.
• For storage over a month, leave at ~40–60% charge in a cool, dry place; avoid extreme heat/cold.

Pros and cons

• Pros: Longest runtime in the XGT lineup, excellent for high‑draw tools, reduced pack swaps, robust protection electronics.
• Cons: Heavier and bulkier than 2.5–5.0Ah packs; higher upfront cost; overkill for light/occasional tasks.

Compatibility notes

• Fits all Makita XGT 40V max tools directly.
• Powers 80V max XGT tools when used as one of two batteries in series.
• Does not fit 18V LXT or 12V CXT tools. XGT chargers can charge LXT packs with the ADP10 adapter, but this battery cannot power LXT tools.

Safety tips

• Secure the pack fully before use; the extra mass can affect balance on overhead or ladder work.
• Do not charge below 32°F (0°C) or above 104°F (40°C). Avoid leaving batteries in hot vehicles.
• Inspect the housing after drops; discontinue use if cracked or leaking.

FAQ

• What is the part number? 191L29-0, commonly referenced as BL4080F in Makita literature.
• How long does a full charge take? About 76 minutes on the DC40RA Rapid Charger under normal conditions.
• Will it fit my 18V LXT tools? No. XGT and LXT are different platforms and are not cross‑compatible for tool use.
• Does it have a charge indicator? Yes, a built‑in LED fuel gauge shows remaining charge.
• Is this the best choice for every tool? Not always—choose smaller Ah packs for lighter, overhead, or intermittent tasks to reduce weight and improve handling.