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Google Pixel XL Compatible Battery B2PW2100 3.85V 3400mAh

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From $25.99 USD $31.99
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Fits Google Pixel XL with OEM part number B2PW2100 or 35H00263-00M.
3.85V and 3400mAh Li-Polymer cell restores full daily runtime on the Pixel XL.
Connector seats flush into the battery slot; locking tab clips down without force.
We ran full discharge cycles on the bench; the BMS accepted USB-PD without fault codes.
On first use after installation, disable fast charging for one complete discharge-charge cycle—this lets the fuel gauge IC recalibrate against the new cell discharge curve before high-current fast charging pushes current into an uncalibrated cell.
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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

3.85V

Amp

3400mAh

Google Pixel XL — 3.85V Li-Polymer Replacement Battery (B2PW2100)

This is a 3.85V, 3400mAh Li-Polymer cell for the Google Pixel XL smartphone. It fits the G-2PW2100, G-2PW2200, and G-2PW2100-021-B model variants. Drop this in when your original cell no longer holds enough charge to get through a full day.

  • Pixel XL variant coverage: The G-2PW2100 and G-2PW2200 share the same battery bay dimensions, connector pinout, and BMS handshake protocol — all confirmed against OEM part numbers B2PW2100 and 35H00263-00M.
  • Bench tested on actual hardware: We cycled this cell on a Pixel XL unit and confirmed the BMS handshake completed correctly, charge termination triggered at full voltage, and the fuel gauge IC accepted the new cell without throwing a hardware fault.
  • First-cycle fuel gauge reset: After installation, disable fast charging and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC one clean cycle to map the new cell's discharge curve before fast charge current is applied to an uncalibrated cell.

Why the Pixel XL reports wrong battery percentage after a cell swap

The Pixel XL uses a coulomb counter IC that builds its charge model against the cell it has observed over many cycles. When you install a new cell, the IC is still running the old degraded cell's curve. This mismatch causes the percentage display to jump, stall, or report full charge when the cell is not actually full. One complete discharge-to-shutdown followed by an uninterrupted charge to 100% forces the IC to recalibrate against the new cell. After that single cycle, percentage reporting stabilises.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC triggers a shutdown based on the old cell's voltage cliff map — not the actual state of the new cell. The new Li-Polymer cell holds voltage well through most of its capacity curve, then drops steeply near the bottom. If the IC hasn't recalibrated, it reads that steep drop as 0% while the display still shows 20–30%. Run the first-cycle calibration described above, and confirm the cell rests at or above 3.85V open-circuit before reinstalling — a cell shipped below 3.0V per cell may need a slow pre-charge before the BMS will allow a normal charge cycle.

Compatible Models

Pixel XL G-2PW2100 G-2PW2200 G-2PW2100-021-B Nexus M1 Nexus M1 Global TD-LTE

Replaces Part Numbers

B2PW2100 35H00263-00M

Technical Specifications

Voltage3.85V
Amp Hours3400mAh
Capacity3400mAh
Rate13.09Wh
Net Weight49g /1.73 oz
Gross Weight74g /2.61 oz
Approximate Weight74g /2.61 oz
Dimension 73.90 x 66.60 x 4.00mm

Product Highlights

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

Frequently Asked Questions

My Pixel XL won't power on at all after the new battery sat in a drawer for a few months — is the cell dead?

Likely not dead — just in BMS lockout. Li-Polymer cells in storage self-discharge, and if the cell dropped below roughly 2.5V, the BMS cuts all output to prevent damage. Plug the phone into a wall charger (not a PC port) and leave it for 20–30 minutes without pressing the power button — the charge IC will trickle current into the cell until voltage climbs above the BMS re-enable threshold. If the charging indicator still hasn't appeared after that, check that the battery connector is fully seated before assuming a faulty cell.

Fast charging stopped working after I replaced the battery — the phone only charges slowly now

The Pixel XL's USB-PD fast charge protocol requires the BMS on the new cell to complete a handshake with the charge IC before high-current charging is permitted. On the very first cycle, this handshake sometimes doesn't complete until the phone has seen at least one full charge at standard rate. Charge the phone to 100% on a standard 5W charger without interruption, then reboot, and reconnect to your USB-PD charger — fast charging typically resumes on that second cycle once the BMS has confirmed cell state.

The phone feels noticeably warm near the back during charging with the new battery — should I be concerned?

A new Li-Polymer cell starts with higher internal impedance than a broken-in cell, so the charge IC pushes slightly more voltage to drive current in during early cycles. This produces more heat than you'd see with a well-cycled cell. The warmth should reduce noticeably after three to five full charge cycles as impedance drops. If the back of the phone is too hot to hold comfortably, or the heat persists past five cycles, check that the battery connector pins are making clean contact — a partially seated connector increases resistance and generates excess heat at the junction.

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