About this replacement
Sony PRS-T1 / PRS-T2 / PRS-T3 Series — 3.7V Li-Polymer Replacement Battery (LIS1476)
This is a 3.7V, 700mAh lithium-polymer replacement battery for the Sony Reader Touch Edition e-reader line. It fits the PRS-T1, PRS-T2, PRS-T3, and PRS-T3S. The OEM part number is LIS1476, also cross-referenced as 1-853-104-11 and LIS1476MHPPC(SY6).
- PRS-T1 through PRS-T3S compatibility: All four models share the same 3.7V battery rail, connector pinout, and BMS handshake protocol. Sony carried this cell across the entire T-series without changing the battery spec, so one cell covers all four variants.
- Bench tested on actual hardware: We cycled this cell on a PRS-T1 unit and confirmed the BMS accepted the cell without fault flags. Charge acceptance was normal from first connection, and the protection circuit tripped correctly at low-voltage cutoff.
- Firmware calibration after swap: After installing, charge the device via USB for a full cycle before using it. The Sony Reader firmware recalibrates its battery percentage display based on a complete charge–discharge cycle — skipping this step causes inaccurate readings for the first several sessions.
Why the PRS-T1 battery percentage jumps around after a cell swap
Sony's Reader firmware stores a charge model in memory tied to the previous cell's behaviour. When a new cell goes in, the firmware is still referencing the old model. This causes the percentage indicator to jump — sometimes reading 80% immediately, then dropping to 20% within minutes. The fix is two full charge-discharge cycles, which forces the firmware to rebuild the charge curve against the new cell's actual capacity.
E-reader shows low battery warning immediately after new cell installed
Replacement cells ship in storage mode — typically around 3.0V to 3.2V — to stay within safe transport limits. The PRS-T1 boot sequence checks resting voltage before loading the OS, and anything below approximately 3.4V triggers an immediate low-battery flag. The device is not faulty and the cell is not defective. Connect the USB cable and leave it on charge for at least 15 minutes before attempting to power on.