About this replacement
Sanyo MM9000 / SCP-9000 — 3.7V Li-ion Replacement Battery (SCP14LBPL-S)
This is a 3.7V, 1050mAh Li-ion replacement cell for the Sanyo MM9000 (also listed as MM-9000 and SCP-9000) mobile phone. It replaces OEM part SCP14LBPL-S directly. Install it when the original cell no longer holds a charge through a normal day of calls and messaging.
- MM9000 / SCP-9000 platform fit: All three model designations — MM9000, MM-9000, SCP-9000 — are the same hardware revision. They share the same battery bay dimensions, connector orientation, and BMS handshake protocol, so one SKU covers all three.
- Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the SCP-9000 platform. The BMS accepted the charge profile without fault codes, and voltage held steady across the discharge curve with no anomalous cutoffs.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the OS starts reading percentage from it.
Why the MM9000 reports wrong battery percentage after a cell swap
The MM9000 uses a fuel gauge IC that tracks charge state against a stored discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches actual cell behaviour. The IC reads voltage and estimates percentage against the old data, so the number on screen drifts from reality. One full slow-rate discharge-charge cycle forces the coulomb counter to reset and relearn the new cell's curve. After that cycle, percentage reporting stabilises.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops below what the modem or display subsystem needs under load, even though the OS still shows charge remaining. A new cell with a slightly different internal resistance curve can hit this voltage cliff earlier than the gauge predicts. The fix is the same recalibration cycle — one full discharge to auto-off, then a full charge without interruption. After two cycles the fuel gauge IC has enough data to predict the voltage cliff accurately and the shutdowns stop.