About this replacement
Kimo 6 Inch Cordless Chainsaw — 20V Li-ion Replacement Battery (K16811)
This is a 20V 4000mAh (80Wh) Li-ion battery pack for the Kimo 6 Inch Cordless Chainsaw and compatible models including QM-6001, QM-T20, and QM-3061B. It slots into the same dock as the original and communicates with the same BMS handshake. Voltage and connector match the K16811 specification exactly.
- QM-series and K16811 platform fit: These models share the same 20V slide-in rail, contact pin layout, and BMS communication protocol — which is why one battery pack covers the full platform without adapters or rewiring.
- Bench tested on actual hardware: We ran this pack through repeated motor-start cycles on a K16811 unit. The BMS held the inrush spike at trigger pull without tripping, and cell voltage stayed above the 18V sag threshold under sustained cutting load.
- Break-in on first use: Run two cutting cycles at half bar load before going full throttle into dense wood. This lets the BMS measure motor inrush current and set overcurrent thresholds before it sees a maximum torque pull.
BMS cutoff on motor-start inrush surge in the K16811
When the chainsaw triggers, the motor draws a spike of current — often three to five times the running draw — in the first 80–120 milliseconds. A BMS that hasn't profiled this inrush pattern may read it as a fault and cut power instantly. On a new or storage-recovered pack, the BMS protection thresholds reset to conservative defaults. Two break-in cycles at partial load teach the BMS the motor's actual inrush signature before it locks thresholds.
Charger blinking red on a new pack that's been sitting in storage
Li-ion cells self-discharge during storage. If cell voltage drops below roughly 2.5V per cell, most chargers refuse to begin a full charge cycle and signal the refusal with a red blink pattern. This is a charger acceptance threshold, not a dead pack. Connect the battery to the charger and leave it for 10–15 minutes — many chargers run a trickle pre-charge to bring cells back above 3.0V before switching to normal CC/CV mode. If the red blink clears and the charger advances to a steady charge, the pack has recovered past the acceptance floor.