About this replacement
Motorola RAZR I / XT890 — 3.8V Li-Polymer Replacement Battery (EG30 / SNN5916A)
This 3.8V, 1940mAh lithium-polymer cell replaces the EG30 battery in the Motorola RAZR I, XT890, MT788, and Electrify M. It matches the original's flat pouch form factor and connector pinout. Capacity comes from the cell itself — 1940mAh at 7.37Wh.
- RAZR I / XT890 platform fit: These models share the same 3.8V power rail, EG30 connector, and BMS handshake protocol. The fuel gauge IC on each device expects a cell with matching discharge curve characteristics — this cell meets that spec.
- Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the XT890. The BMS accepted the cell without fault codes, and the charge IC held a stable current through the CC/CV transition at 4.35V.
- Fuel gauge recalibration after install: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC build a fresh discharge curve against the new cell before high-current charging pushes current into an uncalibrated state.
Sudden shutdown at 20–30% on the RAZR I after a cell swap
The RAZR I's fuel gauge IC carries calibration data from the old cell. When a new cell goes in, the stored discharge curve no longer matches real-world voltage behaviour. The phone sees what it thinks is 25% charge, but the cell voltage has already dropped below the modem's minimum threshold under load. The result is an abrupt shutdown — not a fault, just a mismatch. One full discharge-charge cycle with fast charging off resets the coulomb counter against the new cell's actual curve.
OS reporting erratic or frozen battery percentage after replacement
If the percentage sticks at a fixed number or jumps by large increments, the fuel gauge IC is reading a cell it has no calibration data for. This is common after any cell swap and is not a defective battery. Force the phone to 0% by letting it power off naturally under load, then charge uninterrupted to 100%. After one complete cycle, the coulomb counter recalibrates and percentage reporting stabilises.