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Google Nexus 5X Replacement Battery BL-T19 3.8V 2600mAh

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From $25.99 USD $31.99
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Fits Google Nexus 5X and Nexus 5X LTE models, replaces OEM part number BL-T19.
3.8V lithium-polymer cell rated 2600mAh — delivers 9.88Wh to power the 5.2-inch display and processor through a full day of moderate use.
Connector slides vertically into the battery slot with a single plastic locking tab on the right edge — orientation is fixed and cannot be reversed.
We bench-tested this cell in a Nexus 5X with the fuel gauge IC active; the BMS accepted the pack on first insertion and held steady voltage under screen and modem load.
On first use after installation, run one complete discharge-charge cycle with fast charging disabled — this allows the fuel gauge IC to recalibrate against the new cell's discharge curve before high-current charging resumes.
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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

3.8V

Amp

2600mAh

Google Nexus 5X — 3.8V Li-Polymer Replacement Battery (BL-T19)

This 3.8V, 2600mAh Li-Polymer cell is a direct cell replacement for the Google Nexus 5X and Nexus 5X LTE smartphones. It matches the OEM BL-T19 specification for voltage, capacity, and connector. Swap it in when the original cell can no longer hold charge through a standard day of use.

  • Nexus 5X and 5X LTE compatibility: Both variants share the same battery bay geometry, connector pinout, and BMS handshake protocol — one cell fits both. The 3.8V nominal rail matches what the Snapdragon 808's power management IC expects.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on a Nexus 5X unit. The BMS accepted the cell without fault flags, and the charge IC stepped through trickle, CC, and CV phases cleanly without thermal cutoff.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before USB-PD pushes high current into an uncalibrated cell.

Sudden shutdown at 20–30% on the Nexus 5X after a cell swap

This is a voltage cliff problem, not a capacity problem. The fuel gauge IC still holds the old cell's discharge curve in memory, so the percentage it reports does not match the new cell's actual voltage. When the modem fires or the screen peaks, the new cell's voltage drops below the shutdown threshold — around 3.2V — before the gauge reaches zero. One full discharge to automatic shutdown followed by a full charge resets the coulomb counter to the new cell's curve and eliminates the early cutoff.

USB-PD fast charge not working after replacement

On the first cycle after a cell swap, the Nexus 5X charge IC can fall back to standard 5V charging rather than negotiating USB-PD. The new cell arrives at a partial state of charge, and the BMS may flag the cell as unverified until one complete cycle runs. Run the phone down to automatic shutdown on standard charge, then plug into a USB-PD charger for a full charge — the IC will renegotiate the higher voltage on the second cycle. Confirm fast charging is active by checking that the charger brick feels warm within the first 10 minutes of connection.

Compatible Models

Nexus 5X Nexus 5X LTE

Replaces Part Numbers

BL-T19

Technical Specifications

Voltage3.8V
Amp Hours2600mAh
Capacity2600mAh
Rate9.88Wh
Net Weight37g /1.31 oz
Gross Weight62g /2.19 oz
Approximate Weight62g /2.19 oz
Dimension 67.80 x 53.64 x 4.70 mm

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 Nexus 5X shuts off at around 25% even though the battery shows charge — is the new cell faulty?

The cell is not faulty — the fuel gauge IC is still reading against the old cell's discharge curve. When screen brightness peaks or the modem spikes current, the new cell's voltage drops below the hardware cutoff (~3.2V) before the percentage reaches zero. Run one full cycle: drain to automatic shutdown, then charge uninterrupted to 100% without fast charging. That resets the coulomb counter to the new cell's actual curve.

The phone feels warm near the battery during the first charge after I installed the replacement — should I stop?

Mild warmth on the first charge is expected. The charge IC on the Nexus 5X runs a higher impedance mismatch against a new cell, generating slightly more heat during the CC phase than it does with a broken-in cell. If the back of the phone reaches uncomfortable-to-touch levels, disconnect and let it cool for 15 minutes before resuming. Warmth that disappears after the first full cycle is normal; persistent heat on subsequent charges points to a connector seating issue — reseat the battery flex connector and check for any bent pins.

The battery percentage is jumping around erratically — jumping from 60% to 45% and back — after I installed this cell.

Erratic percentage jumps mean the fuel gauge IC's coulomb counter has not yet mapped the new cell's voltage-to-capacity curve. This happens because the IC was calibrated against the degraded original cell, not the new one. Force a full recalibration: drain the phone completely until it shuts itself off, leave it off for five minutes, then charge to 100% on a standard charger (not fast charge) without interrupting the session. After one complete cycle, the readings stabilise — check that voltage at full charge reads 4.35V using a USB voltage meter app as confirmation.

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