EX34 Motorola XT912A Replacement Battery 3.8V 2200mAh

Motorola Droid RAZR M / Moto X — 3.8V Li-Polymer Replacement Battery (EX34 / SNN5923)

This is a 3.8V, 2200mAh Li-Polymer replacement battery for the Motorola XT912A (Droid RAZR M) and the Moto X / XT1060 series. It replaces OEM part numbers EX34, SNN5923, SNN5923A, and SNN5923B. The cell dimensions match the original battery bay at 81.80 × 55.69 × 3.75mm.

• XT912A and XT1060 platform fit: Both the Droid RAZR M and the Moto X share the same battery connector, voltage rail, and physical bay geometry — which is why one cell covers both. The BMS communicates with Motorola's charge IC over the same three-pin interface used across this generation of Motorola Android hardware.
• Bench tested on actual hardware: We ran this cell on the XT912A. The BMS accepted the initial charge handshake without error, voltage held steady through a full discharge cycle, and the charge IC did not flag an incompatibility fault at any point.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle before enabling it. The fuel gauge IC in these Motorola devices calibrates its coulomb counter against the actual discharge curve of whichever cell is installed — skipping this step leaves the IC running on the old cell's curve, which causes percentage jumps and early shutdowns.

Why the Droid RAZR M shuts down suddenly at 20–30% with a new cell

The RAZR M's Qualcomm modem and display pull current in short, sharp bursts. When the fuel gauge IC is still calibrated to the old, degraded cell, it maps the new cell's voltage curve incorrectly. At around 20–30% reported charge, the actual cell voltage can drop briefly below the shutdown threshold under load — triggering an abrupt power-off even though charge remains. One full discharge-charge cycle forces the coulomb counter to re-map against the new cell, and the premature shutdowns typically stop after that single calibration pass.

Phone won't power on after the replacement battery sat in storage

Li-Polymer cells that sit uncharged for months can drop below 2.5V per cell, which trips the BMS into a protective lockout state. In lockout, the phone shows no response to the power button and no charge indicator on the screen. 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 delivers a low-current trickle that recovers the cell voltage back above the 3.0V threshold, at which point the BMS unlocks and normal charging resumes.