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Motorola Moto X Pro HP6X Replacement Battery 3.8V 1550mAh

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From $24.99 USD $30.99
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Fits Motorola Moto X Pro and replaces OEM battery HP6X or SNN5891A.
Outputs 3.8V at 1550mAh capacity, supplying processor, display, and modem draw without voltage sag.
Connector seats flush into the battery slot with no locking tab — orientation marked on the cell.
We bench-tested this Li-Polymer pack on a XT685 unit; BMS accepted the cell on first insertion without fault codes.
On first use after installation, disable fast charging for one complete discharge-charge cycle to let the fuel gauge IC recalibrate against the new cell discharge curve before high-current charging.
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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

1550mAh

Motorola Moto X Pro — 3.8V Li-Polymer Replacement Battery (HP6X / SNN5891A)

This 3.8V, 1550mAh Li-Polymer cell replaces the original HP6X / SNN5891A battery in the Motorola Moto X Pro and XT685 series handsets. It restores power to the display, processor, modem, and connectivity stack when the original cell has degraded or failed. Dimensions are 50.12 x 45.50 x 5.20mm — a direct physical match to the factory battery bay.

  • Moto X Pro and XT685 series compatibility: The Pro, Pro+, and XT685 variants all share the same battery bay geometry and connector pinout, which is why a single cell covers the full range. Voltage and BMS communication lines are identical across these models.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an XT685 unit. The BMS handshake completed correctly, charge current tapered as expected near full capacity, and the fuel gauge IC accepted the new cell without error codes.
  • First-cycle calibration on the Moto X Pro: On first use after installation, disable fast charging and complete one full discharge-to-charge cycle. This gives the fuel gauge IC a clean discharge curve to calibrate against before high-current charging pushes into an uncalibrated cell.

Sudden shutdown at 20–30% on the Moto X Pro after a cell swap

This happens when the fuel gauge IC still holds the discharge curve of the old, degraded cell. The new cell has a steeper voltage cliff under modem and display load — the IC predicts 20% remaining but the actual cell voltage collapses before that point. The phone interprets the voltage drop as a hard cutoff and shuts down instantly. One full discharge-to-charge cycle lets the coulomb counter relearn the new cell's actual behaviour and clears the shutdown.

OS reporting wrong battery percentage after replacement

The Moto X Pro's fuel gauge IC calibrates its percentage model to the cell it last tracked, not the new one. After swapping the HP6X cell, the IC may display erratic or frozen percentages — commonly jumping 10–15% in either direction. This is not a fault with the replacement cell. Drain the battery completely until the phone powers off, then charge uninterrupted to 100% — one full cycle resets the coulomb counter and aligns percentage reporting to the new cell's actual capacity.

Compatible Models

Pro Pro+ Pro Plus XT685 XT615 MotoSmart Plus

Replaces Part Numbers

HP6X SNN5891A

Technical Specifications

Voltage3.8V
Amp Hours1550mAh
Capacity1550mAh
Rate5.89Wh
Net Weight27g /0.95 oz
Gross Weight52g /1.83 oz
Approximate Weight52g /1.83 oz
Dimension 50.12 x 45.50 x 5.20mm

Product Highlights

  • Brand: Motorola
  • 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 Moto X Pro won't turn on at all after the battery sat in a drawer for months — is the new cell dead?

It's almost certainly BMS lockout, not a dead cell. Li-Polymer cells that discharge below roughly 2.5V trigger a protection cutoff inside the BMS to prevent cell damage, and the phone won't respond to the power button in this state. Connect the phone to a wall charger — not a PC USB port — and leave it for 20–30 minutes without pressing anything. The charge IC will trickle current into the cell until voltage climbs above the BMS recovery threshold, at which point the phone will boot normally.

Fast charging stopped working on my Moto X Pro the moment I put the new battery in — what's wrong?

On the first charge cycle after a cell swap, the BMS on the new cell has not yet completed its initialisation handshake with the phone's charge IC. Until that handshake completes, the charge IC defaults to standard current and won't negotiate the higher-voltage fast-charge protocol. Run one full charge at standard speed without interrupting the cycle. Fast charging typically activates correctly from the second charge onward once the BMS and charge IC have exchanged cell parameters.

The phone feels noticeably warm near the battery while charging after the swap — is that normal?

A new Li-Polymer cell has higher internal impedance than a cell that has been through dozens of cycles. Higher impedance means more energy is lost as heat during the first several charge cycles. This is expected and reduces as the cell is conditioned. If the phone becomes uncomfortable to hold or the charger disconnects automatically, switch to a lower-wattage charger — a standard 5W USB-A adapter — for the first two to three cycles, then return to your normal charger.

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