Sprint Galaxy Note SPH-L900 Replacement Battery 3.7V 2200mAh

Sprint Galaxy Note / SPH-L900 — 3.7V Li-ion Replacement Battery

This 3.7V 2200mAh Li-ion battery fits the Sprint Galaxy Note and Galaxy Note II 4G, including model numbers SPH-L900 and SPHL900GYS. It replaces the original cell when capacity has degraded to the point the phone can no longer hold a usable charge. Dimensions are 75.20 × 55.40 × 5.80mm — confirm these against your existing battery before installing.

• SPH-L900 and Galaxy Note II 4G compatibility: Both devices run on the same 3.7V single-cell architecture with a shared connector and identical BMS handshake protocol, which is why one cell covers both platforms without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SPH-L900 platform. The BMS accepted the cell on first insertion, charge termination triggered correctly at 4.2V, and the protection circuit tripped as expected under a simulated short.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-to-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before the OS starts reporting percentages — skipping this step causes erratic readings for days.

Sudden shutdown at 20–30% on the SPH-L900 after a cell swap

This happens because the fuel gauge IC is still referencing the old cell's voltage-to-capacity curve. A new cell hits a steeper voltage cliff under modem and screen load than the aged cell the gauge was calibrated to. The phone's software sees voltage drop below the shutdown threshold before the displayed percentage reaches zero. One full discharge-charge cycle at standard current resets the coulomb counter and resolves the early shutoff.

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

Li-ion cells self-discharge in storage. If this battery sat long enough to drop below 2.5V per cell, the BMS enters lockout mode to prevent damage and the phone will not respond to the power button. Plug directly into a wall charger — not a USB hub — and leave it for 20–30 minutes without pressing anything. The charge IC will trickle current into the cell until it clears the BMS recovery threshold, typically around 3.0V, at which point the phone boots normally.