Sony Xperia 10 V A202SO Replacement Battery 3.89V 4850mAh

Sony Xperia 10 V / A202SO Series — 3.89V Li-Polymer Replacement Battery (SNYSCA6)

This 3.89V, 4850mAh Li-Polymer battery replaces the original cell in the Sony Xperia 10 V and its carrier variants — A202SO, PDX-225, SO-52C, and SOG07, among others. It restores full charge capacity when the factory cell has degraded, swells, or no longer holds voltage under load. Capacity figure is 18.87Wh as rated.

• Xperia 10 V carrier variants: The A202SO, SO-52C, SOG07, and PDX-225 are the same hardware platform sold across different Japanese carriers. They share an identical battery connector, BMS handshake protocol, and 3.89V nominal voltage rail — so one cell covers all variants.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Xperia 10 V platform. The BMS accepted the cell without error flags, charge termination triggered correctly at 4.35V, and the protection circuit held low-voltage cutoff within spec.
• 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 build an accurate discharge curve against the new cell before the charge IC starts pushing high-current fast-charge rates into an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the Xperia 10 V after a cell swap

This happens when the fuel gauge IC is still running the discharge curve it learned from the old, degraded cell. At around 20–30% reported charge, the new cell hits a voltage point the IC wasn't expecting, and the BMS cuts power before the OS can log a clean shutdown. The fix is one full discharge-charge cycle with fast charging off. After that cycle, the coulomb counter resets its reference points against the actual cell chemistry and the shutdowns stop.

USB-PD fast charge not activating on the first cycle after replacement

After a cell swap, the Xperia 10 V's charge IC sometimes defaults to standard 5V/1.5A charging on the first cycle. This is a BMS initialisation behaviour — the charge IC runs a low-current pre-charge pass to verify cell impedance before it negotiates a higher power contract with the charger. Use the original Sony charger for this first cycle, let it complete fully to 100%, and USB-PD fast charging will activate normally on the second cycle.