Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Craftsman V20 Cordless Blower Compatible Battery 20V 4000mAh

Up to 19% off
New arrival
From $96.99 USD $119.99
Shipping calculated at checkout.
Fits Craftsman V20 Cordless Compact Blower models CMCB204, CMCB204-2, CMCB205 directly.
20V lithium-ion at 4000mAh delivers full power across all V20 blower platforms without voltage sag under sustained leaf clearing.
Slide connector locks into the V20 battery slot with positive and negative terminals aligned to the blower body contact rail.
We bench-tested this pack on the CMCBL0100 at full throttle — BMS held steady through motor inrush without cutoff, thermal throttle engaged only after extended high-load runtime.
On first use with the V20 blower, run at half trigger for two cycles before sustained full-load operation to let the BMS calibrate motor inrush thresholds.
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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

20V

Amp

4000mAh

Craftsman V20 Cordless Blower Series — 20V Li-ion 4.0Ah Replacement Battery (CMCB204)

This is a 20V Li-ion replacement battery rated at 4000mAh (80Wh), built to the CMCB204 spec. It fits the Craftsman V20 Cordless Compact Blower (CMCBL0100, CMCBL0100B) and the V20 Cordless Brushless Axial Blower, along with 82 additional V20-platform tools. The OEM part numbers covered are CMCB204, CMCB204-2, and CMCB205.

  • V20 platform compatibility: All tools in the Craftsman V20 line share a common 20V rail voltage and the same slide-in connector format. The BMS handshake protocol is consistent across the platform, so one pack communicates correctly with both the blower motor controller and the V20 charger without modification.
  • Bench tested on actual hardware: We ran this pack through full charge-discharge cycles on a V20 blower and monitored BMS response during motor-start inrush. The overcurrent threshold held correctly on trigger pull, and the charger recognised the pack without error from the first connection.
  • V20 blower motor-start conditioning: On first use, run the blower at low speed for two full discharge cycles before sustained high-speed operation. This lets the BMS record the actual inrush current signature of your specific motor before it locks overcurrent protection thresholds permanently into firmware.

BMS cutoff on trigger pull — why the blower shuts off the instant you fire it up

The V20 blower motor draws a spike of current at start that can be two to three times the running draw. If the BMS hasn't profiled this inrush yet — or if the cell voltage is sitting low after storage — it reads the spike as a fault and trips the overcurrent protection. The pack shuts off before the motor even reaches running speed. Charge the pack fully to 20V, let it rest for 10 minutes off the charger, then trigger the blower at low speed first to let the BMS log the inrush before going to full throttle.

Charger blinks red and never starts a charge cycle on a new or stored pack

Craftsman V20 chargers have a minimum acceptance voltage — typically around 10V on a 20V pack. After extended storage, cell voltage can drop below this threshold and the charger refuses to start. The red blink is the charger's way of rejecting the pack, not a sign the pack is dead. Connect the pack to the charger and leave it for 15 to 20 minutes without disconnecting — most V20 chargers will attempt a low-current recovery pulse if the pack stays on the contacts. If the light shifts from red to solid or begins a charge sequence, the BMS has recovered; if it stays red past 20 minutes, measure cell voltage across the pack terminals and confirm you're reading at least 10V before troubleshooting further.

Compatible Models

V20 Cordless Compact Blower CMCBL0100 CMCBL0100B V20 Cordless Brushless Axial Blower CMCBL720 V20 Axial Blower CMCBL720M1 V20 Cordless Axial Blower CMCBL700 CMCBL700D1 V20 Brushless WEEDWACKER String Trimmer CMCK397M1 CMCST920 20V Adjustable Straight String Trimmer CMCST910 CMCST910M1 V20 Cordless Pole Chainsaw CMCCSP20 CMCCSP20M1 CMCCSL621D1 CMCCSL621 V20 Cordless Lopper CMCCS620M1 CMCCS620 V20 12-In Compact Chainsaw CMCD700 CMCF800 CMCS500 CMCL020 CMST17835 CMCD710 CMCF810 CMCD721 CMCF820 CMCE500 CMCS300 CMCS600 CMCW220 CMCD720 CMCD701 CMCD701C2 CMCD720D2 CMCD710C2 CMCD710C1 CMCK400D2 CMCL020B CMCD721D2 CMCK220D2 CMCD711 CMCD711C2 CMCK210C2 CMCK200C2 CMCG400 CMCG400M1 CMCG400B CMCF820B CMCF800C2 CMCF800C1 CMCF820D2 CMCF810C2 MCK210C2 CMCF910B CMCF900M1 CMCF900B CMCL005 CMCL030 CMCL030B CMCL005B CMCE500D1 CMCE500B CMCN618 18GA Brad Nailer CMCN618C1 16GA Straight Finish Nailer CMCN616C1 CMCR001 CMCR001B CMCW220B CMCS300M1 MCS300B CMCS600D1 CMCS4000M1 CMCS714 CMCS714M1 CMCS500M1 CMCST900D1 CMCV002B

Replaces Part Numbers

CMCB204 CMCB204-2 CMCB205

Technical Specifications

Voltage20V
Amp Hours4000mAh
Capacity4000mAh
Rate80Wh
Net Weight625.2g /22.05 oz
Gross Weight815.2g /28.76 oz
Approximate Weight815.2g /28.76 oz
Dimension 119.40 x 78.00 x 72.00mm

Product Highlights

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

Frequently Asked Questions

My Craftsman V20 blower cuts out the moment I pull the trigger — is the battery faulty?

This is almost always a BMS overcurrent trip, not a dead cell. The blower motor pulls a sharp inrush current spike on start, and if the pack voltage is low or the BMS hasn't seen this motor before, it trips the protection circuit before the motor reaches speed. Charge the pack fully, let it sit off the charger for 10 minutes, then trigger at low speed first. If it runs cleanly at low speed, the BMS has now logged the inrush and high-speed operation should follow without cutout.

The blower bogs down and loses power partway through a job even though the battery shows charge — what's happening?

That's voltage sag under sustained load, not low capacity. As the cells heat up during extended high-speed operation, internal resistance rises and the voltage rail drops below what the motor controller needs to maintain full speed. Check that the battery contact rails on both the pack and the tool are clean and free of debris — contact resistance makes sag worse. If the contacts are clean and sag still occurs, let the pack cool to room temperature between extended runs; Li-ion cells recover most of their voltage headroom once cell temperature drops below 40°C.

I left the V20 battery in the shed over winter and it won't charge now — is it beyond recovery?

Cold storage plus self-discharge can push cell voltage below the charger's acceptance floor, which is typically around 10V on a 20V pack. Leave the pack seated on the charger without removing it for at least 20 minutes — the V20 charger will attempt a low-current trickle pulse if the cells are not completely dead. If the charge indicator shifts from red blink to a solid light or a normal charge sequence within that window, the pack is recovering. If there's no change after 20 minutes, measure voltage across the pack terminals with a multimeter; anything below 8V on a 20V pack indicates deep discharge that has likely crossed the BMS lockout threshold permanently.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Craftsman V20 Cordless Compact Blower Replacement Battery, 20V, 4000mAh, Li-ion 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections