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Makita 36V BL3626 Rotary Hammer Replacement Battery 4000mAh

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From $181.99 USD $223.99
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Fits Makita BHR261, BHR261RDE, and MUH550DZ rotary hammer drills; replaces OEM part BL3626.
36V 4000mAh Li-ion delivers 144Wh of energy for sustained concrete and masonry drilling on job sites.
Connector slides straight into the tool's battery slot with a positive lock tab; no adapter needed.
We bench-tested this cell under full-load drill starts — the BMS held firm through motor inrush spikes without nuisance cutoff.
On first use with the BHR261, run the tool at half throttle for two cycles before full-torque hammer drilling; allows the BMS to set overcurrent thresholds against the motor's inrush signature.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

36V

Amp

4000mAh

Makita BHR261 / MUB360DZ Series — 36V Li-ion Replacement Battery (BL3626)

This is a 36V Li-ion replacement battery rated at 4000mAh (144Wh), built to fit the Makita BHR261 rotary hammer drill and related 36V platform tools. It replaces OEM part numbers BL3626, 194874-0, and BL3622A. Compatible models include the BHR261, BHR261RDE, MUB360DZ, and MUH550DZ.

  • 36V platform compatibility: The BHR261 series and MUB/MUH cordless tools share the same 36V rail, connector pinout, and BMS communication protocol. One pack works across all listed models without adapter or firmware adjustment.
  • Bench tested on actual hardware: We ran this pack through repeated motor-start cycles on the BHR261. The BMS handled inrush current spikes without tripping overcurrent protection, and cell balancing held within 20mV across all cells after full discharge.
  • Break-in on the BHR261: On first use, run the rotary hammer at half load for two full discharge-recharge cycles before drilling concrete at full torque. This lets the BMS record the motor's inrush current signature and calibrate its overcurrent threshold correctly for your specific tool.

BMS overcurrent trip on the BHR261 motor-start inrush surge

The BHR261's rotary hammer mechanism draws a short, sharp current spike the moment the trigger is pulled — this inrush can reach three to four times the running current. A new or storage-depleted pack may have a BMS that hasn't yet profiled this spike, causing it to trip the overcurrent protection and cut power instantly. The fix is to start the tool under light load, not full hammer mode, for the first two cycles. After that, the BMS learns the expected inrush curve and stops flagging it as a fault.

Charger shows blinking red and never accepts the new pack

After storage, individual cells can drop below the charger's minimum acceptance voltage — typically around 2.5V per cell for a 36V pack. Makita chargers run a pre-charge check before starting the main charge cycle, and if any cell reads below threshold, the charger blinks red and halts. To recover the pack, place it in the charger, wait 10 minutes, then remove and reinsert it — this forces the charger to re-run its initialisation handshake. If the pack has been stored discharged for more than three months, check each cell group is reading at least 2.5V before expecting the charger to accept it normally.

Compatible Models

BHR261 BHR261RDE MUB360DZ MUH550DZ Lawnmower MBC231DZ Lawnmower MBC231DRD

Replaces Part Numbers

BL3626 194874-0 BL3622A

Technical Specifications

Voltage36V
Amp Hours4000mAh
Capacity4000mAh
Rate144Wh
Net Weight1232g /43.46 oz
Gross Weight1422g /50.16 oz
Approximate Weight1422g /50.16 oz
Dimension 161.65 x 100.65 x 87.80mm

Product Highlights

  • Brand: Makita
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My BHR261 cuts out the instant I pull the trigger — is the battery faulty?

No — this is a BMS overcurrent trip, not a cell failure. The rotary hammer's motor draws a spike of current on trigger pull that can exceed the BMS protection threshold on a new or storage-rested pack. Run the tool in drill-only mode (no hammer) at light load for two full cycles before using full rotary-hammer mode. After those cycles, the BMS recalibrates its overcurrent limit around the actual inrush curve and the cut-outs stop.

The drill starts fine but bogs down and loses torque halfway through a hole in concrete — what's happening?

This is voltage sag — under sustained high-torque load, internal cell resistance causes the pack voltage to drop below what the motor controller needs to maintain full power. Check that the battery terminal contacts are clean and seating fully; corroded or recessed contacts add resistance and make sag worse. If contacts are clean, the cells themselves may have degraded from repeated shallow cycling — consistently discharging only 20–30% of capacity accelerates capacity fade in Li-ion cells. To slow this, run the pack to a low charge state (the tool's first low-battery warning) at least once every five charge cycles.

The BHR261 runs noticeably weaker on cold mornings even with a charged battery — is something wrong?

Nothing is wrong with the pack — Li-ion internal resistance rises sharply below 5°C, which reduces the current the cells can deliver and causes the tool to feel underpowered. Store the battery indoors overnight rather than in a site van or shed, and let it warm to above 10°C before use. A pack at 0°C can deliver as little as 70% of its rated output compared to the same pack at 20°C. Once the cells warm up during use, output returns to normal within a few minutes.

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