About this replacement
Sony Xperia 10 / I3123 / I4193 — 3.85V Li-Polymer Replacement Battery (LIP1668ERPC)
This 3.85V, 2800mAh lithium-polymer cell replaces the OEM LIP1668ERPC battery in the Sony Xperia 10 series. It fits the I3123, I4113, and I4193 model variants. Capacity figure is taken directly from product data — 10.78Wh.
- Xperia 10 series compatibility: The I3123, I4113, and I4193 share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers all three. The LIP1668ERPC footprint is 85.25 × 49.42 × 3.90mm, and this replacement matches that exactly.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on an Xperia 10 unit. The BMS accepted the cell without error flags, charge IC ramped normally through CC and CV phases, and the fuel gauge registered capacity within expected tolerance on the first completed cycle.
- First-cycle fuel gauge reset: After installation, disable fast charging and run one full discharge down to automatic power-off, then charge uninterrupted to 100%. This gives the fuel gauge IC a clean discharge curve against the new cell before high-current charging cycles begin.
Sudden shutdown at 20–30% on the Xperia 10 after a cell swap
The Xperia 10 fuel gauge IC holds a learned discharge curve from the original cell. When a new cell goes in, the stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. Under modem or display load, the phone hits a voltage point the old curve maps to 20–30% — but the cell is already below the BMS cutoff threshold. The IC triggers shutdown before the percentage reaches zero. One full uninterrupted discharge-to-poweroff cycle followed by a complete charge resets the coulomb counter and corrects the curve.
USB-PD fast charge not activating on the first cycle after replacement
On the first charge after a cell swap, the Xperia 10 charge IC may fall back to standard 5V charging instead of negotiating the faster voltage contract. This happens because the BMS on the new cell has not yet completed its initialisation handshake with the phone's power management IC. Let the first charge complete fully at standard rate without unplugging mid-cycle. Fast charging typically resumes normally from the second cycle onward once the BMS handshake is established.