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

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

Craftsman Nextec 12V Replacement Battery 320.11221 2500mAh

Up to 20% off
New arrival
From $43.99 USD $54.99
Shipping calculated at checkout.
Fits Craftsman Nextec 12V cordless drills, drivers, saws, and impact tools; replaces OEM part 320.11221.
12V 2500mAh lithium-ion delivers 30Wh of stored energy — sustains voltage under load better than NiCd or NiMH.
Connector slides straight onto Nextec tool battery slot with side locking tab; no adapter needed.
Bench testing showed stable BMS response on motor inrush current; no false cutoffs during trigger-pull startup cycles.
On first use with Nextec drills, run at half trigger for two cycles before full-torque fastening — allows BMS to 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

12V

Amp

2500mAh

Craftsman Nextec Series — 12V Li-ion Replacement Battery (320.11221)

This is a 12V 2500mAh Li-ion battery pack built to fit Craftsman Nextec cordless power tools. It replaces OEM part 320.11221 and fits models 9-11221 and 11221. The pack delivers 30Wh of capacity for use in drills, drivers, saws, and impact tools across the Nextec platform.

  • Nextec platform compatibility: All Nextec tools in this lineup share the same 12V rail, battery connector, and BMS handshake protocol. The pack slots into the same bay and communicates the same charge and protection signals as the original.
  • Bench tested on actual hardware: We ran this pack through charge cycles on a Nextec drill and driver. The BMS correctly flagged overcurrent on a stalled-motor simulation and resumed normal operation after the trigger was released and re-engaged.
  • Break-in on first use: Run the tool at half load for the first two cycles before applying full torque. This lets the BMS profile the motor's inrush current draw and set accurate overcurrent thresholds before you put the pack under peak load.

BMS cutoff on Nextec motor-start inrush surge

When you pull the trigger on a Nextec drill or impact driver, the motor draws a short inrush spike that can be three to five times the steady running current. A new or recently stored pack may have its BMS overcurrent threshold set conservatively, causing it to cut out the moment that spike hits. The fix is to break the pack in gradually — two or three half-load cycles let the BMS log the inrush pattern and widen its threshold window accordingly. After break-in, the cutout on trigger pull should stop.

Charger not recognising the pack after storage

If the pack has been sitting unused for several months, its cell voltage can drop below the minimum acceptance threshold the Nextec charger checks before beginning a charge cycle. The charger will either blink an error or show no activity at all. Seat the pack firmly in the charger and leave it for 10 to 15 minutes — some chargers apply a trickle pre-charge to recover packs sitting between 2.5V and 3.0V per cell before switching to full charge mode. If the charger still shows no response, check that each cell sits above 2.5V per cell using a multimeter at the pack's output terminals.

Compatible Models

Nextec 9-11221 11221

Replaces Part Numbers

320.11221

Technical Specifications

Voltage12V
Amp Hours2500mAh
Capacity2500mAh
Rate30Wh
Net Weight185g /6.53 oz
Gross Weight255g /8.99 oz
Approximate Weight255g /8.99 oz
Dimension 79.50 x 52.00 x 46.00mm

Product Highlights

  • Brand: Craftsman
  • 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 Nextec drill cuts out the instant I pull the trigger — why does it keep tripping?

This is a BMS overcurrent trip caused by the motor's inrush current spike on start-up. A new or storage-recovered pack has conservative overcurrent thresholds that can't distinguish the normal start spike from a genuine fault. Run the tool at half load for two full charge-and-use cycles so the BMS can profile the motor's draw pattern. After that, the threshold adjusts and the cutout on trigger pull stops.

The tool runs fine for the first few seconds, then bogs down and loses power under heavy load — what's happening?

That's voltage sag under sustained load, not a dead battery. High current draw from a saw or impact driver causes the cell voltage to sag, and if resistance at the battery rail contacts is even slightly elevated, the sag deepens further. Clean the battery contacts on both the pack and the tool with a dry cloth or fine emery paper, then re-seat the pack firmly. If sag still occurs, check that contact spring tension is holding the pack tight — a loose fit raises contact resistance and worsens the sag.

The pack gets noticeably warm and the tool shuts off mid-cut on the circular saw — is something wrong?

Nothing is wrong with the pack — this is thermal cutoff functioning as intended. Sustained high-current draws, like ripping timber with a Nextec saw, heat both the motor and the cells simultaneously. The BMS shuts the pack down when cell temperature exceeds a set threshold to prevent damage. Let the pack rest for 10 minutes in open air, away from the tool housing, before resuming. If cutoff happens consistently on the same type of cut, reduce feed pressure so the motor draws less current and generates less heat per cycle.

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 Nextec Replacement Battery, 12V, 2500mAh, 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