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Microsoft Surface Go 1943 DYNZ02 Compatible Battery 7.58V 5100mAh

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From $71.99 USD $88.99
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Fits Microsoft Surface Go model 1943 and replaces OEM part number DYNZ02.
7.58V at 5100mAh capacity delivers 38.66Wh — matches the original power output for full tablet runtime between charges.
Connector seats flush against the battery cavity with a single locking tab on the left edge — orientation locked by the connector shape.
Bench testing showed the fuel gauge IC accepted the new cell after power-on, with voltage curve stable across the full discharge range.
After installation, run one full discharge to automatic shutoff then charge uninterrupted to 100% — this resets the fuel gauge calibration and eliminates inaccurate battery percentage display.
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.

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⚠️ 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

7.58V

Amp

5100mAh

Microsoft Surface Go 1943 — 7.58V Li-Polymer Replacement Battery (DYNZ02)

This is a 7.58V, 5100mAh Li-Polymer battery for the Microsoft Surface Go (Model 1943). It fits the 10-inch 2-in-1 tablet and replaces OEM part DYNZ02 and 916TA135H. Swap it in when the original cell no longer holds a usable charge across a full day of use.

  • Surface Go 1943 fitment: The 1943 model uses a flat Li-Polymer pack with a specific connector pitch and BMS handshake tied to Windows battery reporting. This battery matches that connector and communicates correctly with the Surface firmware so Windows recognises the pack and reports charge state accurately.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a Surface Go 1943 unit. The BMS accepted the charge handshake on the first cycle, and Windows battery reporting initialised without a hardware flag or driver warning.
  • Fuel gauge calibration after installation: After fitting this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100% without using the tablet. This gives the fuel gauge IC a complete reference curve against the new cell and clears the inaccurate percentage readings that commonly appear after a swap.

Why the Surface Go 1943 shuts down at 15–25% remaining

The Surface Go draws simultaneous load from the display, WiFi, and background sync processes. Under that combined load, cell voltage drops sharply below the BMS cutoff threshold before the percentage gauge reaches zero. The fuel gauge IC was calibrated to the old, degraded cell, so the percentage shown no longer maps accurately to actual voltage. Running one full discharge-to-shutoff cycle after the swap recalibrates the curve and stops premature cutoffs.

Fast charging unavailable after battery replacement

If the Surface Go shows a slow or standard charge rate after a battery swap, the USB-PD negotiation between the charger and the new cell's BMS may not have completed a full accepted cycle yet. The charge controller confirms pack parameters before enabling higher current draw. Plug in the original Microsoft charger and let the tablet complete one uninterrupted charge from below 20% to 100%. After that cycle, USB-PD negotiation completes and the faster charge rate becomes available.

Compatible Models

Surface Go 1943

Replaces Part Numbers

DYNZ02 916TA135H

Technical Specifications

Voltage7.58V
Amp Hours5100mAh
Capacity5100mAh
Rate38.66Wh
Net Weight173g /6.10 oz
Gross Weight433g /15.27 oz
Approximate Weight433g /15.27 oz
Dimension 271.80 x 99.70 x 4.00mm

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 Go is showing 40% battery but then shuts off without warning — is the new battery faulty?

It is not faulty. The fuel gauge IC inside the Surface Go was calibrated to your old, worn cell, so the percentage reading no longer matches the actual voltage of the new pack. Under display and WiFi load, voltage drops quickly past the BMS cutoff point before the gauge reaches zero. Run one full discharge to automatic shutoff, then charge uninterrupted to 100% — that resets the calibration curve and stops the unexpected shutoffs.

Windows is reporting my Surface Go battery percentage jumping around or dropping faster than expected right after the swap — what's happening?

The fuel gauge IC carries over its calibration data from the previous cell, which has different voltage-to-capacity characteristics than the new one. That mismatch causes the percentage to drift, jump, or fall faster than actual capacity warrants. This is not a hardware fault. Complete one full discharge-to-automatic-shutoff cycle followed by an uninterrupted charge to 100%, and the IC will map its curve to the new cell correctly.

The Surface Go feels warm near the charging port during the first few charges after the swap — should I be concerned?

Some warmth during initial charging is normal. The charge IC on the new cell runs a conditioning sequence on the first few cycles as it establishes the correct current and cutoff parameters for the fresh pack. As long as the tablet is not hot to the touch and the warmth fades within a few minutes of unplugging, nothing is wrong. If it stays hot after charging completes, check that the charger output matches the Surface Go spec of 15V at the USB-PD negotiation step.

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Microsoft Surface Go 1943 Replacement Battery, 7.58V, 5100mAh, Li-Polymer 1

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