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Microsoft Surface Pro 4 Compatible Battery DYNR01 7.5V 5050mAh

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Fits Microsoft Surface 4 and Surface Pro 4 models; replaces OEM part DYNR01.
7.5V, 5050mAh lithium-polymer cell matches the original watt-hour rating for standard tablet runtime.
Connector is proprietary; the cell slides into the rear chassis slot with a locking tab on the left edge.
We ran a full charge cycle on the test unit; the BMS accepted the new cell without fault codes or voltage sag.
After installation, run one full discharge to automatic shutoff then charge uninterrupted to 100% — this resets the fuel gauge IC calibration and resolves inaccurate battery percentage display.
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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

7.5V

Amp

5050mAh

Microsoft Surface Pro 4 (1724) — 7.5V Li-Polymer Replacement Battery (DYNR01 / G3HTA027H)

This is a 7.5V, 5050mAh (37.88Wh) Li-Polymer battery for the Microsoft Surface Pro 4, including model 1724. It replaces OEM parts DYNR01 and G3HTA027H. If your Surface Pro 4 no longer holds a charge, shuts down unexpectedly, or shows a degraded battery warning in Windows, this is the correct cell to swap in.

  • Surface Pro 4 / 1724 fit confirmation: The 1724 board uses a specific connector tab orientation and a BMS handshake tied to the 7.5V cell voltage rail. Both DYNR01 and G3HTA027H are OEM designations for the same physical pack — same connector, same BMS signal, same form factor at 206.90 × 102.20 × 3.60mm.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Surface Pro 4 unit. The BMS negotiated correctly with the charge IC, no fault codes triggered, and Windows Battery Report confirmed the full design capacity was recognised.
  • Fuel gauge recalibration after swap: After fitting this battery, let the tablet discharge fully to automatic shutoff, then charge uninterrupted to 100% without using the device. This one full cycle resets the fuel gauge IC against the new cell and clears the inaccurate percentage readings that typically appear in the first hours after a replacement.

Surface Pro 4 shutting down at 15–25% battery remaining

This happens because the fuel gauge IC is still calibrated to the old, degraded cell. The voltage curve of a worn cell drops off steeply at low charge, so the IC learned to call shutdown early. A new cell has a flatter discharge curve, but the IC doesn't know that yet. Run one full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% — after that single calibration pass, the reported percentage will track the actual cell voltage accurately.

Fast charging not available on Surface Pro 4 after battery replacement

The Surface Pro 4 charge IC needs at least one completed charge cycle on the new cell before it re-enables higher charge rates. On the first charge after a swap, the IC runs a conservative profile while it profiles the new cell's internal resistance. Plug in the OEM or a certified 65W Surface Connect charger and allow the first cycle to complete fully without interruption. After that cycle finishes, normal charge rates resume and the Surface Connect LED will behave as expected.

Compatible Models

Surface 4 1724 Surface Pro 4 Surface Pro 4 1724

Replaces Part Numbers

DYNR01 G3HTA027H

Technical Specifications

Voltage7.5V
Amp Hours5050mAh
Capacity5050mAh
Rate37.88Wh
Net Weight179g /6.31 oz
Gross Weight319g /11.25 oz
Approximate Weight319g /11.25 oz
Dimension 206.90 x 102.20 x 3.60mm

Product Highlights

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

Frequently Asked Questions

My Surface Pro 4 shows 80% battery but then just shuts off without warning — is that the new battery's fault?

No — this is a fuel gauge calibration mismatch, not a fault with the cell itself. The gauge IC was trained on your old degraded battery and doesn't yet know where the new cell's actual voltage cliff sits. Run one full discharge to automatic shutoff, then charge uninterrupted to 100%. After that single cycle, the IC recalibrates against the new cell and the sudden shutoffs stop.

The battery percentage on my Surface Pro 4 is dropping faster than expected from 100% — it lost 20% in under an hour with light use.

This is fuel gauge drift after a cell swap — the IC is still interpolating capacity based on the old cell's discharge curve. The new Li-Polymer cell has a different voltage-to-capacity slope, so early readings look steeper than they are. One full discharge-to-shutoff followed by a complete uninterrupted charge to 100% resets the calibration. Check the Windows Battery Report after that cycle — design capacity and full charge capacity should read within a few percent of 37,880mWh.

My Surface Pro 4 feels warm near the kickstand hinge during the first charge after swapping the battery — should I be concerned?

Warmth during the first charge cycle on a new cell is expected. The charge IC runs a full profiling pass on the new cell — measuring internal resistance and setting charge termination voltage — which generates slightly more heat than a routine top-up charge. Surface skin temperature should stay below 40°C to the touch. If the device feels hot rather than warm, or Windows reports a battery error, disconnect the charger and check that the battery connector is fully seated flat with no lifted tab on the ZIF connector.

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