About this replacement
Amazon Kindle 3 — 3.7V Li-Polymer Replacement Battery (S11GTSF01A)
This 3.7V, 1900mAh lithium-polymer battery replaces the original cell in the Amazon Kindle 3 e-reader. It fits the Kindle 3 Wi-Fi and Kindle 3G variants, all sharing the same battery footprint and connector. Dimensions are 96 × 67 × 4mm — confirm clearance before installing.
- Kindle 3 platform fit: The Kindle 3, Kindle III, Kindle 3 Wi-Fi, and Kindle 3G all use the same battery bay, connector pin-out, and BMS handshake. One cell covers the full Kindle 3 generation without modification.
- Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on a Kindle 3 unit. The BMS accepted the new cell without fault flags, and the firmware cycled through its calibration pass on the first full charge.
- Post-swap charge cycle on the Kindle 3: After fitting this cell, connect via USB and let it charge completely before switching the device on. Kindle 3 firmware recalibrates the battery percentage display during that first full charge — skipping it leaves the indicator inaccurate for days.
Why the Kindle 3 shows a low battery warning immediately after a new cell
Replacement Li-Polymer cells ship at storage voltage — typically 3.6–3.85V, which sits below the Kindle 3's firmware threshold for a "full" reading. The device sees an unrecognised charge state and throws a low battery warning even though the cell is not flat. This is a firmware calibration issue, not a faulty battery. Connect to USB and charge fully before first use — the warning clears once the cell reaches 4.2V and the firmware logs a complete cycle.
Kindle 3 battery percentage jumping around after a cell swap
The Kindle 3 estimates state-of-charge by tracking voltage curves it learned from the old, degraded cell. After a swap, those learned curves no longer match the new cell's discharge profile, so the percentage gauge jumps — sometimes dropping 20% suddenly then recovering. The firmware corrects this by running two or three full charge-discharge cycles to relearn the curve. Run the battery down to the auto-shutdown point, then charge fully, twice — the percentage display stabilises after that.