Samsung Galaxy Note SPH-L900 Replacement Battery 3.8V 3100mAh

Sprint Galaxy Note / SPH-L900 — 3.8V Li-ion Replacement Battery

This 3.8V, 3100mAh Li-ion battery replaces the original cell in the Sprint Galaxy Note and Galaxy Note II 4G, including SPH-L900 and SPHL900GYS variants. It matches the factory voltage rail and connector format. Swap it when the original cell can no longer hold charge through a normal day of calls, messaging, and apps.

• SPH-L900 and Galaxy Note II 4G fitment: These Sprint-badged models share the same battery bay dimensions and 3.8V charge cutoff, so one cell covers the group. The connector orientation and BMS handshake point are identical across the variants listed.
• Bench tested on actual hardware: We cycled this cell through the charge IC on SPH-L900 hardware and confirmed the BMS accepted the charge handshake without flagging an incompatible cell error. Cutoff voltage held at the expected 4.35V ceiling and low-voltage protection triggered correctly at the floor.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This lets the coulomb counter re-map its tracking curve to the new cell before high-current charging pushes current into an uncalibrated state.

Why the Galaxy Note reports wrong battery percentage after a cell swap

The Galaxy Note uses a fuel gauge IC that builds its charge-level model against the old cell's discharge curve. When you install a new cell, that curve no longer matches, so the reported percentage drifts — often reading full when it isn't, or jumping downward suddenly. One complete slow discharge to shutdown followed by an uninterrupted charge to 100% forces the IC to re-learn the new cell's characteristics. Until that cycle completes, percentage readings are estimates, not measurements.

Sudden shutdown at 20–30% on the SPH-L900

This happens when the cell voltage drops below the threshold the modem or display needs to sustain load, even though the fuel gauge still shows charge remaining. The gauge's coulomb counter is tracking energy, but under peak draw the cell voltage collapses faster than the counter predicts. The BMS then cuts power to protect the cell. Run the device down to 0% once, charge it to 100% without interruption, and verify the open-circuit voltage reads at least 4.30V at full charge.