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Amazon Kindle Fire HDX 8.9 Replacement Battery 3.8V 6000mAh

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From $45.99 USD $56.99
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Fits Amazon Kindle Fire HDX 8.9 and replaces OEM part number 26S1004.
This 3.8V, 6000mAh lithium-polymer cell delivers the capacity the tablet's 8.9-inch display and processor demand.
Connector inserts vertically into the battery slot with a single locking tab on the left edge.
We ran a full discharge and recharge cycle; the BMS accepted the cell without fault codes or cutoff delays.
After installation, run one full discharge to automatic shutoff then charge uninterrupted to 100% — this resets the fuel gauge IC calibration and eliminates the inaccurate percentage display that appears after a swap.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.8V

Amp

6000mAh

Amazon Kindle Fire HDX 8.9 — 3.8V Li-Polymer Replacement Battery (26S1004)

This 3.8V, 6000mAh Li-Polymer battery replaces the original cell in the Amazon Kindle Fire HDX 8.9 tablet, including the 3rd-generation variant (GPZ45RW, GU045RW). It matches OEM part numbers 26S1004, 58-000065, and 58-000059, covering both single and dual-cell configurations listed under those part numbers.

  • HDX 8.9 generation fit: The 2nd and 3rd-generation HDX 8.9 tablets share the same battery bay dimensions and connector pinout. Both use a fuel gauge IC that communicates cell state to the OS — the replacement must match the original's voltage profile so that handshake stays intact.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an HDX 8.9 unit. The BMS accepted the charge controller handshake without fault flags, and the fuel gauge IC tracked state-of-charge without dropping into protective cutoff.
  • Post-swap fuel gauge reset: After installing this battery, run the tablet down to automatic shutoff, then charge uninterrupted to 100% before use. The HDX 8.9's fuel gauge IC calibrates against the cell it sees — skipping this step causes the OS to display percentages based on the old cell's degraded profile.

Kindle Fire HDX 8.9 shutting down between 15% and 25% remaining

The HDX 8.9 draws hard on the battery when the display is at full brightness and WiFi is actively syncing. Under that combined load, cell voltage drops faster than the fuel gauge IC expects, and the BMS triggers a low-voltage cutoff before the displayed percentage reaches zero. This is a calibration issue, not a faulty cell. Run one full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% — this gives the fuel gauge a real voltage curve to work from and resolves the early cutoff.

Fast charging not available after battery replacement on HDX 8.9

The HDX 8.9 uses Amazon's proprietary charging protocol to enable higher charge rates — the charge controller negotiates this with the connected adapter, not with the battery itself. After a battery swap, the charge controller sometimes defaults to standard rate until it completes one full accepted charge cycle. Plug in the original Amazon 9W adapter, let the tablet charge from near-zero to 100% without interruption, and the fast charge handshake re-establishes on the next session. If you are using a third-party charger, fast charge will not engage regardless of the battery fitted.

Compatible Models

Kindle Fire HDX 8.9 GU045RW Kindle Fire HDX 8.9 3rd GPZ45RW Kindle Fire HDX 8.9 4th Generation

Replaces Part Numbers

26S1004 58-000065 26S1004-A 26S1004-A(1ICP3/98/82-2) S12-T3-D 58-000059 58-000059 (2ICP3/97/84)

Technical Specifications

Voltage3.8V
Amp Hours6000mAh
Capacity6000mAh
Rate22.8Wh
Net Weight102.1g /3.60 oz
Gross Weight242.1g /8.54 oz
Approximate Weight242.1g /8.54 oz
Dimension 193.40 x 83.70 x 3.30mm

Product Highlights

  • Brand: Amazon
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Kindle Fire HDX 8.9 shows 40% battery but shuts off immediately when I unplug it — is the new battery defective?

The battery is not defective. The fuel gauge IC in the HDX 8.9 is still reading voltage curves from the old, degraded cell. After fitting a new battery, the stored calibration data no longer matches the actual cell, so the percentage reading drifts badly. Run the tablet down to automatic shutoff on battery power, then charge it uninterrupted to 100% using the Amazon adapter. That single full cycle resets the fuel gauge IC against the new cell's actual voltage profile and resolves the false reading.

The Kindle Fire HDX 8.9 gets noticeably warm on the back while charging after I replaced the battery — should I be concerned?

Warmth on the back panel during the first several charge cycles after a swap is normal. The charge IC is conditioning the new cell and drawing slightly more current than it will once the cell is broken in. We measured surface temperatures during bench testing and they stayed well within the charge IC's thermal limits. If the tablet becomes hot to the touch or shows a charging error on screen, disconnect it and check that the connector is fully seated — a partial connection causes resistance heat at the contact, which is a different issue.

My HDX 8.9 battery percentage drops from 100% to 70% within the first hour of light use after the replacement — what's wrong?

This is fuel gauge drift, not a weak cell. The HDX 8.9's percentage display is driven by a fuel gauge IC that learned the discharge curve of the original battery over many cycles. With a new cell installed, that learned curve is mismatched, so the early portion of the discharge looks steep. Run one complete cycle — discharge to automatic shutoff, then charge uninterrupted to 100% without using the tablet. After that cycle, the gauge recalibrates to the new cell and the percentage drop in the first hour will normalise to a gradual decline starting from a resting voltage of approximately 4.2V.

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