Sprint LX265 Replacement Battery 3.7V 950mAh Li-ion

Sprint LX265 / Rumor 2 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 950mAh (3.52Wh) lithium-ion cell for the Sprint LX265 and Rumor 2 smartphones. It slots directly into either handset and restores power to calls, messaging, and onboard applications. Use the capacity figure from the product data — 950mAh — as your reference, not third-party listings.

• LX265 and Rumor 2 compatibility: Both handsets share the same battery bay dimensions, connector pin-out, and 3.7V supply rail. The BMS handshake is identical across the two models, so one cell covers both without modification.
• Bench tested on actual hardware: We cycled this cell on an LX265 unit and confirmed the BMS accepted the new cell, reported a valid state-of-charge signal, and did not trigger a charge-fault flag on first connection.
• Fuel gauge recalibration on first use: On first installation, disable fast charging if your charger supports it and run one complete discharge-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes energy into an uncalibrated counter.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity defect. Under modem transmit or screen-on load, the cell voltage drops sharply even when the fuel gauge still reads 20–30%. The phone's protection circuit reads that voltage sag as a low-cell condition and shuts down to prevent deep discharge. Run one full discharge to near 0% and charge back to 100% — this resets the coulomb counter and gives the fuel gauge IC a real floor voltage to reference. After that cycle, shutdowns at mid-charge typically stop.

Phone shows incorrect battery percentage after cell swap

The fuel gauge IC on the LX265 stores a learned discharge curve from the old cell. When a new cell goes in, that stored curve no longer matches real cell behaviour, so percentage readings jump or read high until the phone drains. Drain the battery until the phone powers off on its own, then charge uninterrupted to 100% without unplugging early. One complete cycle is usually enough for the IC to recalibrate to the new cell and report accurate percentages.