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ST11 Amazon Kindle Fire HD 8 5th Gen Replacement Battery 3.7V

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From $29.99 USD $36.99
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Fits Amazon Kindle Fire HD 8 5th generation tablet; replaces OEM ST11, ST11A, 58-000127, and 26S1009 battery packs.
3.7V lithium-polymer cell rated 3210mAh; supplies continuous power through the 8-inch display and WiFi radio during daily use.
Connector seats flat against the logic board with a single friction-fit locking tab; no additional clips or adhesive required.
We bench-tested the ST11 cell across charge cycles and confirmed BMS handshake completes without fault codes; full-charge detection activates normally.
After installation, run one full discharge to automatic shutoff then charge uninterrupted to 100% — this resets the fuel gauge IC calibration against the new cell and resolves inaccurate percentage display.
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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.

Delivery and Shipping

🔹 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

3.7V

Amp

3210mAh

Amazon Kindle Fire HD 8 5th Generation — 3.7V Li-Polymer Replacement Battery (ST11)

This 3.7V, 3210mAh lithium-polymer battery replaces the original ST11 cell in the Amazon Kindle Fire HD 8 5th Generation (model SG98EG). It fits the 8-inch tablet used for reading, streaming, and everyday app use. OEM part numbers ST11, ST11A, 58-000127, 26S1009, and 26S1009-A are all covered by this single replacement cell.

  • Kindle Fire HD 8 5th Gen compatibility: The SG98EG shares a single battery platform across the 5th Generation HD 8 lineup. The ST11 connector pinout and BMS handshake are identical across all SG98EG units — one cell fits the full production run without any modification.
  • Bench tested on actual hardware: We ran this cell on a Kindle Fire HD 8 5th Gen unit and confirmed the BMS accepted the new cell without fault codes, completed a full charge cycle without thermal cutoff, and reported voltage correctly at both ends of the discharge curve.
  • Fuel gauge recalibration after swap: After installing this battery, run the tablet down to automatic shutoff, then charge it uninterrupted to 100% without using the device. This lets the fuel gauge IC recalibrate against the new cell and clears the inaccurate percentage readings that typically appear in the first few cycles after a swap.

Kindle Fire HD 8 shutting down at 15–25% after battery replacement

The Kindle Fire HD 8 combines display backlight, WiFi radio, and processor load simultaneously during streaming or browsing. That combined draw creates a sharp voltage sag that the fuel gauge IC misreads as a low-battery cutoff — even when meaningful charge remains. The original fuel gauge calibration was mapped to the old, degraded cell, so its voltage curve no longer matches the new battery. Run one full discharge to automatic shutoff followed by an uninterrupted charge to 100%, and the shutdowns at 15–25% will stop. After that cycle, the device should hold voltage above 3.5V well into single-digit percentages.

Fast charging not available on Kindle Fire HD 8 after battery swap

The Kindle Fire HD 8 uses Amazon's proprietary charge negotiation over the micro-USB port — the charge IC needs one completed charge cycle on the new cell before it will negotiate the higher current draw. Plugging in immediately after installation often results in standard 5V/1A charging only. Use the original Amazon power adapter, not a third-party charger, and allow the first charge cycle to complete fully without interruption. After that cycle, the adapter and charge IC handshake correctly and faster charging resumes at the expected rate.

Compatible Models

Kindle Fire HD 8 5th Kindle HD 8 SG98EG

Replaces Part Numbers

ST11 58-000127 ST11A 26S1009 26S1009-A(1ICP3/113/84)

Technical Specifications

Voltage3.7V
Amp Hours3210mAh
Capacity3210mAh
Rate11.88Wh
Net Weight58g /2.05 oz
Gross Weight93g /3.28 oz
Approximate Weight93g /3.28 oz
Dimension 111.00 x 85.70 x 2.40 mm

Product Highlights

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

Frequently Asked Questions

My Kindle Fire HD 8 shows 80% battery but jumps straight to dead — why does this happen after putting in a new battery?

The fuel gauge IC inside the Kindle Fire HD 8 builds its percentage map against the old cell's voltage curve. A new ST11 cell has a different discharge profile, so the readings are off from the start. The percentage display will skip or drop suddenly because the IC is firing the low-voltage cutoff at a point that doesn't match the new cell. Run one full discharge to automatic shutoff and then charge uninterrupted to 100% — after that single cycle the readings stabilise.

The Kindle Fire HD 8 gets warm near the charging port while charging the new battery — is something wrong?

Warmth near the charge IC is normal during the first few cycles on a new lithium-polymer cell. The ST11 cell draws at its maximum accepted current while the charge IC works through the constant-current phase, which generates more heat than a partially degraded original cell would. The warmth should reduce noticeably after the first two or three full cycles as the IC settles into its charge profile. If the device becomes hot to the touch or shows a charging error, disconnect and check that the micro-USB cable is not damaged.

My Kindle Fire HD 8 percentage drops faster from 100% than it did with the original battery — is the replacement faulty?

This is fuel gauge drift, not a cell fault. The Kindle's charge IC estimated a full-charge capacity based on the worn-out original cell, so 100% on the old map is a smaller number than what the new 3210mAh cell actually holds. The percentage counter runs through its old scale faster than the new cell depletes. Complete one full discharge to automatic shutoff followed by an uninterrupted charge to 100%, and the IC will recalculate capacity against the new cell — the percentage drop rate will normalise after that calibration cycle.

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