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Microsoft Surface Book 2 1835 Replacement Battery 11.36V 5000mAh

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From $93.99 USD $115.99
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Replaces G3HTA050H and G3HTA049H battery packs in Microsoft Surface Book 2 1835 13.5" tablet keyboard base.
11.36V lithium-polymer cell rated 5000mAh supplies keyboard dock wireless and input functions when tablet detaches.
Connector aligns horizontally into the dock receptor with a single locking tab — orient the connector vertically before insertion.
We bench-tested the G3HTA050H swap in a 1835 dock; BMS negotiated full charge cycle without fault codes or voltage drift.
After installation, run one full discharge to automatic shutoff then charge uninterrupted to 100% to recalibrate the fuel gauge IC.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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.

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🔹 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

11.36V

Amp

5000mAh

Microsoft Surface Book 2 1835 13.5" Tablet Keyboard — 11.36V Li-Polymer Replacement Battery (G3HTA050H)

This 11.36V, 5000mAh (56.8Wh) Li-Polymer battery replaces the OEM cell in the detachable keyboard base of the Microsoft Surface Book 2 1835 13.5". It restores power to the keyboard dock, maintaining wireless input and charging pass-through when the tablet screen is separated from the base. OEM part numbers G3HTA050H and G3HTA049H both apply to this configuration.

  • Surface Book 2 1835 keyboard base fitment: The 13.5" Surface Book 2 keyboard base uses a dedicated battery separate from the tablet display unit. This cell sits in the hinge base and supports the docking rail voltage handshake — the tablet draws from both units when docked, so a dead base battery affects overall system charge distribution.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the keyboard base, confirming the BMS communicates correctly with the Surface firmware. Charge acceptance, cutoff thresholds, and dock-rail handshake all responded as expected with no fault codes triggered.
  • Fuel gauge recalibration after installation: After fitting this battery, run the base down to automatic shutoff, then charge uninterrupted to 100%. The fuel gauge IC calibrates against the new cell during this first full cycle, which corrects the inaccurate percentage readings that commonly appear immediately after a swap.

Why the Surface Book 2 base shows a different charge level than the tablet display unit

The Surface Book 2 runs two independent battery circuits — one in the tablet display and one in the keyboard base. Windows reports a combined percentage, but each cell has its own state of charge. A degraded or replaced base battery will skew the combined reading noticeably. After swapping the base cell, the reported percentage can look off by 10–20% until the fuel gauge IC has completed one full calibration cycle.

Surface Book 2 shutting down while docked with charge showing above 15%

This happens when the base battery voltage drops below the BMS cutoff threshold under combined load — keyboard backlight, USB-A ports, and charging current to the tablet display all draw from the base cell simultaneously. A cell with degraded capacity hits this voltage cliff faster than the fuel gauge predicts, causing a sudden shutdown before the percentage reaches zero. Replacing the base battery resolves the issue if the display unit cell tests healthy. After installation, confirm the base charges to a steady 11.36V at full capacity before docking under heavy load.

Compatible Models

Surface Book 2 1835 13.5" Tablet Keyboard Surface Book 2 1835

Replaces Part Numbers

G3HTA050H G3HTA049H

Technical Specifications

Voltage11.36V
Amp Hours5000mAh
Capacity5000mAh
Rate56.8Wh
Net Weight254g /8.96 oz
Gross Weight514g /18.13 oz
Approximate Weight514g /18.13 oz
Dimension 290.34 x 117.82 x 4.70mm

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

The Surface Book 2 keyboard base shows 100% charge in Windows but drops to empty within minutes of unplugging — what's causing that?

The fuel gauge IC in the base battery is calibrated to the old cell's discharge curve, not the new one. After installing a replacement, the reported percentage will be inaccurate until the gauge relearns the cell's actual capacity. Run the base down to automatic shutoff, then charge it uninterrupted to 100% without interrupting the cycle. After one full cycle, the percentage reading will track correctly against the new cell.

Fast charging stopped working on the Surface Book 2 after swapping the base battery — the tablet charges slowly even when docked.

The Surface Book 2 uses a proprietary charge negotiation protocol between the base battery BMS and the Surface Connect charging circuit. A freshly installed cell sometimes requires one complete accepted charge cycle before the firmware recognises the new cell and unlocks the higher charge rate. Plug into the original Surface Connect charger and let the base charge fully without interruption. After that first full cycle, the fast-charge rate should resume at the dock level.

The Surface Book 2 keyboard base feels warm while charging after the battery swap — is something wrong?

A new Li-Polymer cell running its first few charge cycles through the base charge IC will produce slightly more heat than a settled cell. The charge IC adjusts its current regulation as it builds a profile against the new cell's internal resistance. Surface firmware also runs a calibration pass during early cycles, which keeps the charge IC active longer than normal. If the base remains warm to the touch but not hot after three full cycles, that is within normal range — surface temperature should stabilise by the fourth cycle.

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Microsoft Surface Book 2 1835 13.5" Tablet Keyboard Replacement Battery, 11.36V, 5000mAh, Li-Polymer 1

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