Kimo K16811 20V Cordless Chainsaw Replacement Battery 4000mAh
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Kimo K16811 20V Cordless Chainsaw Replacement Battery 4000mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Kimo K16811 20V Cordless Chainsaw Replacement Battery 4000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
20V
Amp
4000mAh
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.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Kimo
- 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 Kimo chainsaw cuts out the instant I pull the trigger — is the battery dead or is something else tripping it?
That instant cutout on trigger pull is almost always a BMS overcurrent trip, not a dead pack. The motor-start inrush spike hits in the first 100 milliseconds and can exceed the BMS threshold — especially on a cold or freshly charged pack where protection limits default to their tightest settings. Remove the battery, wait 30 seconds, reinsert, and try a light partial-throttle pull first. If it holds through a soft start, run two half-load cycles to let the BMS profile the inrush before you go to full cutting load.
The chainsaw feels weak and bogs down halfway through a cut even though the battery shows charged — what's happening?
That's voltage sag — the cell voltage drops under sustained load faster than the indicator can track, and the motor loses torque before the pack is actually depleted. The first place to check is the battery rail contacts on both the pack and the tool body; oxidation or debris on the contact pins raises resistance and makes sag worse. Clean the contacts with a dry cloth, reseat the pack firmly, and check that the locking tab clicks fully into the slot. If sag continues, the pack's internal resistance may have risen — check resting voltage after a full charge; it should read at or above 20V before load.
The chainsaw ran fine yesterday but today it barely moves and the air temperature dropped overnight — is the battery failing?
Li-ion internal resistance rises sharply below 5°C, which cuts the current the cells can deliver and makes the tool feel sluggish or underpowered. The pack isn't failing — it's behaving exactly as Li-ion chemistry does in the cold. Bring the battery indoors and let it warm to room temperature (above 15°C) for 20–30 minutes before use. Do not apply external heat; passive warming is enough to bring resistance back down and restore normal output.
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