About this replacement
Amazon Fire HD 6 — 3.7V Li-Polymer Replacement Battery (58-000092)
This 3.7V, 3400mAh lithium-polymer battery replaces part number 58-000092 in the Amazon Fire HD 6 tablet. It fits the ST06 and PW98VM hardware variants, along with the Kindle Fire HD 6 and related models. Capacity figures come from the product specification — 12.58Wh total.
- Fire HD 6 platform fit: The ST06 and PW98VM boards share the same 3.7V single-cell power rail, connector pinout, and BMS handshake protocol. One cell covers the full model range without voltage or communication mismatches.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on Fire HD 6 hardware. The BMS accepted the charge IC handshake without flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
- Fuel gauge recalibration after swap: After installation, run the tablet down to automatic shutoff, then charge uninterrupted to 100% without using the device. This forces the fuel gauge IC to map its reference points against the new cell and clears the inaccurate percentage readings that appear after a battery replacement.
Fire HD 6 shutting down between 15–25% remaining
This happens because the display backlight and active Wi-Fi together create a combined load spike that the degraded — or newly installed, uncalibrated — cell cannot sustain. The BMS reads the resulting voltage sag as a critical low-voltage condition and triggers a protective shutdown before the reported percentage reaches zero. The fix is a full recalibration cycle: discharge to automatic cutoff, then charge to 100% in one uninterrupted session. After one complete cycle the fuel gauge IC re-establishes accurate voltage-to-percentage mapping and the premature shutdowns stop.
Fire HD 6 reporting wrong battery percentage after replacement
The Fire HD 6 fuel gauge IC stores calibration data tuned to the original cell's charge curve. Swap the cell and that stored data no longer matches the new battery's actual voltage profile, so the percentage display drifts — often jumping or freezing at certain values. This is not a fault with the replacement cell. Run one full discharge to automatic shutoff followed by a continuous charge to 100% with the screen off. After that single cycle the gauge recalibrates and percentage accuracy returns to normal.