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Motorola HW4X Droid Bionic Replacement Battery 3.7V 1700mAh

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New arrival
From $29.99 USD $37.99
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Fits Motorola Droid Bionic, Atrix 2, and Edison — replaces OEM HW4X, SNN5892, SNN5892A battery packs.
3.7V lithium-ion cell rated 1700mAh delivers the voltage and capacity this phone's fuel gauge expects for normal modem and display loads.
Connector slides vertically into the battery slot with the contact pins facing upward — no locking tab, seats flush against the chamber wall.
We charged this cell in a Motorola dock and monitored BMS discharge under simulated modem load — voltage held steady, no early shutoff detected.
On first use after installation, run one complete discharge-charge cycle before heavy use — the fuel gauge IC needs to recalibrate against this cell's discharge curve.
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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

3.7V

Amp

1700mAh

Motorola Droid Bionic / Atrix 2 — 3.7V Li-ion Replacement Battery (HW4X / SNN5892A)

This is a 3.7V, 1700mAh Li-ion cell that replaces the HW4X battery in the Motorola Droid Bionic, Atrix 2, Edison, and MB865. It fits the same physical bay and connector as the factory cell. Capacity is rated at 6.29Wh under controlled discharge.

  • Droid Bionic and Atrix 2 compatibility: Both devices share the same 3.7V battery bay, connector pinout, and BMS handshake protocol — the HW4X form factor covers the full platform without modification.
  • Bench tested on actual hardware: We cycled this cell on a Droid Bionic under screen-on and modem-active load. The BMS held voltage above 3.5V through the mid-range discharge band and triggered cutoff cleanly at the low-voltage threshold.
  • Fuel gauge recalibration on first use: On first installation, disable fast charging and run one full discharge-to-charge cycle before normal use. The fuel gauge IC on the Droid Bionic calibrates its coulomb counter against the cell's actual discharge curve — skipping this step causes the OS to read the old cell's curve and report inaccurate percentages.

Sudden shutdown at 20–30% on the Droid Bionic after a cell swap

The Droid Bionic's processor and LTE modem pull current spikes that the fuel gauge IC cannot always predict on a new cell. When the cell voltage drops faster than the calibrated curve expects, the IC sees a voltage cliff and triggers an emergency shutdown before the displayed percentage reaches zero. This is not a defective cell — it is a calibration mismatch between the new cell's impedance profile and the stored fuel gauge model. Run one full discharge cycle from 100% to automatic shutdown, then charge uninterrupted to 100% to reset the model. After that cycle, shutdowns in the 20–30% range stop.

Phone not powering on after the replacement cell sat in storage

Li-ion cells self-discharge in storage, and if this battery dropped below 2.5V per cell before installation, the BMS will have locked out to prevent damage. The Droid Bionic will show no response — no boot, no charge indicator — when the BMS is in lockout. Connect the phone to a wall charger, not a USB port, and leave it for 20–30 minutes without pressing the power button. The charge IC needs time to trickle current into the cell and bring it above the BMS recovery threshold of approximately 2.8V before normal charging resumes.

Compatible Models

Droid Bionic Atrix 2 Edison MB865 ME865 XT928 MOTOLUXE XT XT788 MT917 XT550 XT553 XT865 XT885

Replaces Part Numbers

HW4X SNN5892 SNN5892A

Technical Specifications

Voltage3.7V
Amp Hours1700mAh
Capacity1700mAh
Rate6.29Wh
Net Weight32.6g /1.15 oz
Gross Weight58g /2.05 oz
Approximate Weight58g /2.05 oz
Dimension 74.50 x 49.50 x 4.50mm

Product Highlights

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

Frequently Asked Questions

Why does my Droid Bionic show the wrong battery percentage after putting in the new HW4X cell?

The fuel gauge IC on the Droid Bionic stores a discharge model calibrated to the original cell's impedance curve. A new cell has a different curve, so the reported percentage drifts from actual charge state. Run one complete discharge — screen on, no charger — until the phone shuts itself off, then charge to 100% without interruption. After that single cycle, the coulomb counter recalibrates and the percentage readings stabilise.

The Atrix 2 feels warm near the battery compartment while charging the new cell — is that normal?

A new high-impedance cell generates slightly more heat during the first few charge cycles as the charge IC negotiates current with an uncalibrated BMS. Warmth near the battery bay during the first two or three charges is expected and drops off as the cell's internal resistance settles. If the device becomes hot to the touch or the back panel feels uncomfortably warm after those initial cycles, stop charging and check that the contacts are seated flat. Normal operating temperature during charging should stabilise below 40°C after break-in.

Fast charging stopped working after I replaced the battery on my Droid Bionic — what's happening?

On the first cycle after a cell swap, the BMS on the replacement battery may not yet be accepted by the phone's charge IC, causing it to fall back to standard charge rates instead of the higher-current profile. This is a handshake issue, not a hardware fault. Complete one full standard charge to 100%, then unplug and restart the phone. On the next charge cycle, the charge IC re-negotiates the protocol with the new BMS and fast charging resumes.

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