Sanyo SCP-09LBPL-S Compatible Battery 3.7V 1000mAh

Sanyo SCP-5400 / SCP-5500 Series — 3.7V Li-ion Replacement Battery (SCP-09LBPL-S)

This is a 3.7V, 1000mAh Li-ion replacement battery for the Sanyo SCP-5400, SCP-5500, SCP-5455, and VM-4500. It replaces OEM part number SCP-09LBPL-S. Fit this when the original cell no longer holds a charge or the phone shuts down unexpectedly under load.

• SCP-5400 / SCP-5500 platform fit: These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — one cell covers the full compatibility group without hardware modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SCP-5400 platform. The BMS accepted the cell cleanly, protection thresholds tripped at the correct cutoff voltages, and the charge IC completed a full cycle without fault flags.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes into an uncalibrated cell — preventing erratic percentage readings from the first charge onward.

Sudden shutdown at 20–30% on a replacement cell

This is a voltage cliff issue, not a capacity defect. The fuel gauge IC was calibrated to the discharge curve of the old, degraded cell — it misjudges how much charge remains in the new cell. Under modem transmit or screen load, voltage drops sharply and the BMS triggers a hard cutoff before the percentage reaches zero. One full discharge-charge cycle resets the coulomb counter and maps the new cell's curve accurately. After that cycle, shutdowns at false-high percentages should stop.

Phone warm near the battery during the first few charges

A new replacement cell typically has higher internal impedance than a broken-in cell. The charge IC pushes current into that higher-impedance cell and dissipates the difference as heat — this is normal for the first two to three cycles. Monitor with a finger on the back cover: warm is expected, hot enough to be uncomfortable is not. If the phone stays uncomfortably hot past the third full cycle, check that the charge IC is not stuck in fast-charge mode and cap the charge current using any available battery care setting in the phone's software menu.