About this replacement
Sanyo SCP-6200 / SCP-6400 — 3.7V Li-ion Replacement Battery
This 3.7V, 750mAh lithium-ion cell replaces the factory battery in the Sanyo SCP-6200 and SCP-6400 smartphones. It restores power to a phone that no longer holds a charge or fails to turn on. Voltage and capacity match the original spec exactly.
- SCP-6200 and SCP-6400 compatibility: Both handsets share the same battery bay dimensions, voltage rail, and connector pinout. A single cell fits both without modification or adapter.
- Bench tested on actual hardware: We cycled this cell through a full charge and discharge on the SCP-6200 platform. The BMS accepted charge current without fault, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
- 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 is applied to an uncalibrated cell.
Sudden shutdown at 20–30% on the SCP-6200
This happens when the cell voltage drops sharply under modem or display load — a voltage cliff the fuel gauge IC did not predict. The phone shuts down to protect the hardware even though the reported percentage still looks safe. It is common on replacement cells before the coulomb counter has completed a full calibration cycle. Run one uninterrupted discharge to 0% and a full charge to 100% to correct the IC's model.
Phone not powering on after the battery sat in storage
If the replacement cell shipped in a deep-discharged state, the BMS may lock out charging below 2.5V per cell. The phone will appear completely dead — no charge indicator, no boot screen. Connect it to a wall charger and leave it untouched for 20–30 minutes. The charge IC will trickle current into the cell until voltage climbs above the BMS re-enable threshold, then normal charging resumes.