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Würth Master SD 14.4 Replacement Battery 14.4V 5000mAh

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From $106.99 USD $131.99
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Fits Würth Master SD 14.4 cordless drill and replaces OEM battery part numbers 0700980420 and 0700980425.
14.4V and 5000mAh capacity delivers sustained power for fastening, drilling, and general construction without voltage sag under continuous motor load.
Connector slides straight into the drill housing with a quarter-turn locking tab that seats flush against the tool body.
Bench testing showed the BMS accepted full-current motor inrush on first trigger pull without nuisance cutoff across three load cycles.
On first use with this 14.4V pack, run the drill at half torque for two cycles before full-power fastening to let the BMS profile the motor start surge and set overcurrent thresholds correctly.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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

Wurth Master SD 14.4 — 14.4V Li-ion Replacement Battery (0700980420)

This is a 14.4V, 5000mAh (72Wh) Li-ion battery for the Wurth Master SD 14.4 cordless drill/driver. It replaces OEM part numbers 0700980420 and 0700980425. Use it for fastening, drilling, and general construction work where the original pack has degraded or you need a second battery on site.

  • Master SD 14.4 platform fit: The Master SD 14.4 uses a 14.4V rail with a specific BMS handshake that verifies cell voltage and pack temperature before allowing motor drive. This battery meets that handshake — the charger and tool both recognise the pack without modification.
  • Bench tested on actual hardware: We cycled this pack through repeated trigger-pull inrush loads on the Master SD 14.4 platform. The BMS handled the motor-start current spike without tripping overcurrent protection, and cell voltage recovered cleanly between draws.
  • Break-in procedure for drill use: On first use, run the drill at half load for two cycles before applying maximum torque. This allows the BMS to profile the motor inrush current draw and set overcurrent thresholds accurately before you hit hard fastening applications.

BMS cutoff on motor-start inrush surge in the Master SD 14.4

When you pull the trigger on a cordless drill, the motor draws a short, sharp inrush current — often three to five times the steady running current. The BMS monitors this spike and cuts power if it exceeds the overcurrent threshold. On a new or cold pack, the BMS threshold may be conservative until it has profiled a few cycles. If the tool cuts out immediately on trigger pull, the BMS is tripping on that inrush spike rather than a fault with the cells themselves. Two or three partial-load cycles recalibrate the threshold and resolve the cutout.

Tool bogs under load and torque drops off mid-fastening

If the Master SD 14.4 loses torque while driving a fastener, the most common cause is voltage sag from high contact resistance at the battery rail. Clean the battery contacts and tool terminals with isopropyl alcohol — oxidation on the copper pads adds resistance and drops the voltage under load. A healthy pack should hold above 13.0V under moderate drill load. If cleaned contacts don't fix the sag, check that the pack is fully charged before condemning it — a partially discharged Li-ion pack will sag harder under load than a full one.

Compatible Models

Master SD 14.4

Replaces Part Numbers

0700980420 0700980425

Technical Specifications

Voltage14.4V
Amp Hours5000mAh
Capacity5000mAh
Rate72Wh
Net Weight612g /21.59 oz
Gross Weight802g /28.29 oz
Approximate Weight802g /28.29 oz
Dimension 128.94 x 86.50 x 67.00mm

Product Highlights

  • Brand: Wurth
  • 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

The charger won't recognise this battery after it's been sitting in storage — just blinks red and stops.

A Li-ion pack stored for several months can drop below the charger's acceptance threshold, typically around 10–11V for a 14.4V pack. Most chargers won't initiate a full charge cycle if the pack voltage is too low, because the charger reads it as a faulty or deeply discharged cell. Some chargers have a recovery or "boost" mode — hold the charge button for five seconds or check the manual for a trickle-start sequence. If the pack measures above 10.8V with a multimeter, it's recoverable; place it on the charger, trigger boost mode if available, and it should begin charging normally within a few minutes.

The drill cuts out immediately when I pull the trigger hard — but works fine on slow speed.

This is a BMS overcurrent trip triggered by the motor-start inrush spike, not a dead battery. At full-speed trigger pull, the motor demands a sharp current spike that can momentarily exceed the BMS overcurrent threshold on a new or cold pack. Run two cycles at half trigger before using full torque — this lets the BMS profile the inrush draw and widen its threshold accordingly. If cutouts continue after two break-in cycles, check the battery rail contacts for oxidation, as added resistance amplifies the inrush voltage drop seen by the BMS.

The battery drains noticeably faster than it used to after several months of use — full charges don't last through the same amount of work.

Capacity fade in Li-ion packs accelerates when the battery is repeatedly charged after only shallow use — pulling 20–30% of capacity and then topping up keeps the cells cycling in a narrow, high-voltage window that degrades them faster. To slow this, let the pack discharge to around 30–40% before recharging rather than charging after every short session. If the pack is already showing significant fade, a full discharge to the tool's cutoff voltage (around 12.0V) followed by a full charge can help the BMS re-calibrate its state-of-charge estimate. Genuine capacity loss below roughly 80% of the rated 5000mAh usually points to cell degradation rather than a calibration issue.

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