About this replacement
Amazon Kindle 10th Generation — 3.7V Li-Polymer Replacement Battery (26S1019)
This 3.7V, 900mAh lithium-polymer cell replaces the factory battery in the Amazon Kindle 10th generation (J9G29R / B07DLPWYB7). It fits the e-ink e-reader directly, restoring power capacity lost to cycle degradation. Capacity listed is from the product specification: 900mAh / 3.33Wh.
- Kindle 10th generation fit: The J9G29R board runs a single-cell Li-Polymer architecture at 3.7V nominal. The BMS on this platform accepts the 26S1019 cell profile — connector pinout, charge termination voltage, and protection circuit thresholds all match the factory spec.
- Bench tested on actual hardware: We cycled this cell through the Kindle 10th charge controller at 5V USB input. The BMS accepted the charge curve without error flags, and the protection circuit tripped correctly at low-voltage cutoff — no thermal events observed across three full cycles.
- First charge after cell swap: After installing, charge via USB for a complete cycle before turning the device on. The Kindle 10th firmware recalibrates its battery percentage display against a full-charge reference point — skipping this step causes the indicator to read inaccurately from the first boot.
Why the Kindle 10th shows low battery immediately after a new cell
Replacement cells ship at storage voltage — typically 3.6–3.85V, well below the 4.2V full-charge ceiling. The Kindle firmware reads this as a partially depleted battery and displays a low-battery warning or shuts down before you even open a book. This is a firmware calibration issue, not a faulty cell. Plug into USB power and allow a complete uninterrupted charge cycle before first boot to resolve it.
Kindle 10th not powering on after battery replacement
If the cell voltage has dropped below roughly 3.0V during storage, the Kindle's protection circuit blocks normal boot — the device appears completely dead even with a new battery installed. Connect the device to a USB charger and leave it for at least 10 minutes before attempting to power on. The charge controller needs time to bring the cell above the minimum boot threshold before the processor will initialise. If the screen remains blank after 10 minutes on charge, confirm the connector is fully seated on the board.