Sony SGPBP02 Tablet S Replacement Battery 3.7V 5000mAh

Sony Tablet S Series — 3.7V Li-Polymer Replacement Battery (SGPBP02)

This is a 3.7V, 5000mAh Li-Polymer replacement battery for the Sony Tablet S range, fitting the SGPT111CN, SGPT112CN, Tablet S1, and Tablet S2. It uses OEM part number SGPBP02 and matches the original cell's connector, voltage rail, and physical footprint. If the original battery won't hold a charge or the tablet dies unexpectedly, this cell is the direct swap.

• SGPT111CN, SGPT112CN, Tablet S1, and Tablet S2 fit: All four models share the same SGPBP02 cell, the same 3.7V single-cell architecture, and the same BMS connector pinout — the fuel gauge IC communicates over the same data line across the entire Tablet S platform.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Tablet S platform. The BMS accepted the cell without fault codes, completed the charge handshake correctly, and the protection circuit tripped at the expected low-voltage cutoff threshold without hard-locking the device.
• Post-swap fuel gauge reset: After fitting this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. The Tablet S fuel gauge IC calibrates itself against the new cell during this cycle — skipping it causes the percentage display to read inaccurately from the first charge.

Why the Sony Tablet S shuts down between 15% and 25% remaining

The Tablet S draws hard on the battery when the display is at full brightness and Wi-Fi is actively transmitting — this combined load creates a voltage sag the fuel gauge IC reads as critically low. On an aged or freshly swapped cell that hasn't been calibrated, the IC triggers a shutdown before the real state of charge reaches zero. The cutoff threshold is voltage-based, not percentage-based, so the displayed number at shutdown can look misleadingly high. Run one full discharge cycle after fitting this battery to sync the IC's map to the new cell's actual discharge curve.

Tablet S showing 100% immediately after swap then dropping fast

This happens because the fuel gauge IC still holds the old cell's charge map in memory after a battery swap. The new 5000mAh cell has a different internal resistance and discharge curve, so the IC's estimates drift badly until it sees one full cycle. The percentage can drop from 100% to under 50% in what feels like a fraction of the expected time. Discharge the tablet completely to automatic shutoff, then charge it to 100% without interruption — after that single cycle the reported percentage will track accurately.