Makita BL3626 36V Rotary Hammer Replacement Battery 3000mAh

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

This is a 36V, 3000mAh Li-ion replacement battery for the Makita BHR261 rotary hammer drill. It also fits the BHR261RDE, MUB360DZ, and MUH550DZ. Use the OEM part numbers BL3626, 194874-0, or BL3622A to confirm compatibility with your existing pack.

• BHR261 and MU-series compatibility: These models share the same 36V battery rail, slide-in connector, and BMS handshake protocol. The same pack slides into the rotary hammer and the hedge trimmer or brushcutter variants without adaptation.
• Bench tested on actual hardware: We ran this pack through repeated motor-start trigger cycles on a BHR261. The BMS handled inrush current correctly on each pull, held the voltage rail steady through sustained concrete drilling, and tripped thermal cutoff only when cell temperature reached the expected threshold.
• Break-in on first use: On first use, run the drill at half load light concrete or masonry for two full cycles before pushing maximum torque. This lets the BMS profile the motor’s inrush draw and calibrate overcurrent thresholds before heavy-duty chiseling.

BMS overcurrent trip on motor-start inrush in the BHR261

Rotary hammer drills draw a sharp current spike the moment you pull the trigger particularly in hammer mode. If the BMS hasn’t profiled the motor yet, that inrush can exceed the default overcurrent threshold and trip the pack before the bit starts turning. A freshly installed replacement pack is most vulnerable on the first few pulls. Running two break-in cycles at reduced load lets the BMS log the inrush pattern and raise its threshold accordingly.

Charger shows blinking red on a new BL3626 pack after storage

Li-ion cells discharged below roughly 2.5V per cell will be rejected by most Makita chargers as a safety measure. A pack that sat in storage can drop below charger acceptance voltage. To recover it, check cell voltage with a multimeter if the pack reads below 30V total, try a compatible charger with a recovery or wake-up mode. Once cells are back above the acceptance floor, the charger will recognise the pack and begin the normal charge cycle.