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DeWalt DE9141 14.4V Cordless Drill Replacement Battery 5000mAh

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From $109.99 USD $135.99
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Fits DeWalt DC733K2, DC731KA, DC735KA, DCD930B2 and 80+ models; replaces OEM DE9141 battery pack.
14.4V 5000mAh lithium-ion delivers consistent torque on fastening and drilling without voltage sag mid-task.
Slide connector locks straight into DeWalt's 14.4V slot with positive contact on both rails engaged.
We bench-tested this pack on motor-start inrush; BMS held stable through trigger-pull spikes without early cutoff.
On first use with this 14.4V pack, run the drill at half load for two cycles before maximum torque applications — allows the BMS to profile motor inrush current before locking overcurrent thresholds.
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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

14.4V

Amp

5000mAh

DeWalt DC733K2 / DC731KA Series — 14.4V Li-ion 5000mAh Replacement Battery (DE9141)

This is a 14.4V Li-ion battery rated at 5000mAh (72Wh), built to the DE9141 specification. It fits the DeWalt DC733K2 compact drill/driver kit along with the DC731KA, DC735KA, DCD930B2, and over 80 additional 14.4V DeWalt platforms. The connector and BMS handshake match the original DeWalt 14.4V slide-pack interface.

  • 14.4V slide-pack platform compatibility: The DC733K2, DC731KA, DC735KA, and DCD930B2 all share the same 14.4V slide-rail connector and BMS communication protocol. One battery services the entire platform without adapters or firmware changes.
  • Bench tested on actual hardware: We ran this pack on a DC733K2 under repeated motor-start cycles. The BMS handled inrush current without tripping, held the 14.4V rail steady through fastening sequences, and reported state-of-charge correctly to the tool's indicator.
  • Break-in on your drill/driver: On first use, run the tool at half load for two cycles before maximum-torque applications. This lets the BMS profile the motor's inrush current draw and calibrate its overcurrent protection threshold before you hit the drill hard.

BMS cutoff on motor-start inrush surge in the DC733K2

The DC733K2 motor draws a sharp current spike the instant the trigger is pulled — this inrush can be three to five times the steady-state draw. A new pack from storage has a partially discharged cell stack, which raises internal resistance and amplifies the voltage dip at that spike. If the BMS reads the dip as an overcurrent event, it trips and cuts power before the motor reaches speed. Running two partial-load cycles first lets the BMS set its inrush threshold accurately against a warm, profiled cell stack.

Charger shows blinking red on a new DE9141 pack after storage

DeWalt 14.4V chargers check cell voltage before starting a charge cycle — if any cell reads below approximately 2.5V per cell, the charger rejects the pack and blinks red. A battery that has sat in storage for several months can drift below that threshold through self-discharge. To recover it, place the pack in the charger and hold it there for 10–15 minutes without removing it — most DeWalt chargers include a trickle-recovery mode that brings low cells up to the acceptance voltage before switching to full charge. If the light stays red past 20 minutes, check that the slide-rail contacts are clean and making full contact.

Compatible Models

DC733K2 DC731KA DC735KA DCD930B2 DCD935B2 DC832KL DW941K DC730KA DC830KB DW918 DCD930L2 DCD935L2 DW906 DC528N DCD920KX DCD930 DCD930KX DCD930VX DCD935 DC528 (Flash Light) DC551KA DC612KA DC613KA DC614KA DC615KA DC728KA DC731KB DC732KL DC733KA DC733KL DC735KB DC757KA DC757KB DC830KA DC835KA DC835KB DC930KA DC935KA DC935KB DC935VA DC936KA DC936VA DC983KA DC983SA DC984KA DC984KB DC984VA DC985KA DC985VA DW054K-2 DW055K-2 DW911 DW928K DW928K-2 DW931K DW931K-2 DW935 DW935K DW937K DW941K-2 DW954 DW954K-2 DW966K DW966K-2 DW969K-2 DW983K DW983K-2 DW984 DW984KS-2 DW984K-2 DW985 DW985KV-2 DW985K-2 DW990K-2 DW991B DW991KC-2 DW991KQ-2 DW991KS-2 DW991K-2 DW992K-2 DW994KQ DW996KQ DW996KV-2 DW996K-2

Replaces Part Numbers

DE9141

Technical Specifications

Voltage14.4V
Amp Hours5000mAh
Capacity5000mAh
Rate72Wh
Net Weight535.8g /18.90 oz
Gross Weight815.8g /28.78 oz
Approximate Weight815.8g /28.78 oz
Dimension 101.30 x 85.56 x 118.30mm

Product Highlights

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

Frequently Asked Questions

My DC733K2 cuts out the instant I pull the trigger on hard material — is the battery faulty?

This is a BMS overcurrent trip, not a faulty cell. The motor-start inrush spike on the DC733K2 is highest when drilling dense material at full torque from a cold start, and a new or storage-rested pack has higher internal resistance that deepens the voltage dip at that moment. Run two light-load cycles first to let the BMS calibrate its overcurrent threshold against a warmer, profiled cell stack. After that, the cutout on trigger pull should stop.

The drill feels weak and bogs under load even though the battery shows full charge — what's happening?

That's voltage sag — the 14.4V rail is dropping under sustained load rather than holding steady. The most common cause is resistance at the slide-rail contacts, not a failed cell. Clean the battery contacts and tool contacts with a dry cloth or isopropyl alcohol, then reseat the pack firmly. If the bogging continues after that, check whether the pack has been repeatedly charged at low capacity — shallow cycling accelerates capacity fade in Li-ion cells and raises internal resistance over time.

The drill loses noticeable power in cold weather even on a full charge — is the battery draining faster?

Li-ion internal resistance rises sharply below 5°C, which reduces the current the cells can deliver without the voltage rail sagging. The pack capacity itself hasn't changed, but the cells can't discharge as fast in the cold, so the tool feels underpowered under load. Store the battery indoors at room temperature before heading out to a cold job site, and keep a spare pack in your jacket pocket to rotate in when the active one cools down. The power recovers fully once the cells return to room temperature.

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