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Amazon Kindle Oasis 3 ST29 Replacement Battery 3.8V 1100mAh

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From $28.99 USD $35.99
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Replaces Amazon OEM part number ST29 and 58-000252 for Kindle Oasis 3 e-readers.
3.8V, 1100mAh lithium-polymer cell restores full charge capacity to the display and processor.
Connector slides into the battery slot with a single locking tab — no adhesive required.
Bench testing showed normal BMS startup at 3.2V and stable voltage under sustained e-ink refresh cycles.
After installation, charge via USB-C for one complete cycle before reading — firmware recalibrates battery percentage display after cell 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.

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.

Disclaimer

⚠️ 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

1100mAh

Amazon Kindle Oasis 3 — 3.8V Li-Polymer Replacement Battery (ST29 / 58-000252)

This 3.8V, 1100mAh Li-Polymer cell replaces the original battery in the Amazon Kindle Oasis 3 e-reader. It matches the OEM part numbers ST29 and 58-000252. Physical dimensions are 67.54 × 32.80 × 3.60mm — confirm against your existing cell before fitting.

  • Kindle Oasis 3 fit: The Oasis 3 uses a slim Li-Polymer pouch cell on a 3.8V rail with a multi-pin connector that carries both power and BMS data back to the firmware. This cell matches that connector pinout and voltage rating exactly.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on an Oasis 3 unit. The BMS handshake completed without fault codes, and the device accepted a full charge cycle without dropping to error state.
  • Post-swap charge cycle on the Oasis 3: After fitting, connect via USB-C and run one complete charge to 100% before use. The Oasis 3 firmware recalibrates its battery percentage display against a full charge cycle — skipping this step causes the gauge to read inaccurately from the first use.

Why the Oasis 3 shows an incorrect battery percentage after a cell swap

The Oasis 3 firmware tracks battery state using a coulomb counter that accumulates data on the original cell over time. When a new cell goes in, the counter still holds the old cell's history. Until the firmware runs through a complete charge-to-discharge cycle, the percentage reading will drift or jump. This is not a fault with the replacement cell — it is the firmware recalibrating. Run one full charge and at least one partial discharge before trusting the gauge.

Kindle Oasis 3 not powering on after battery replacement

Replacement Li-Polymer cells are shipped at storage voltage — typically around 3.6–3.7V — which can sit below the Oasis 3's minimum boot threshold. The device will appear completely dead even with the new cell installed. Connect the USB-C cable to a known working charger and leave it for at least 10 minutes without pressing any buttons. Once the cell clears the boot threshold, the charging screen will appear and the device will start normally.

Compatible Models

Kindle Oasis 3

Replaces Part Numbers

ST29 58-000252

Technical Specifications

Voltage3.8V
Amp Hours1100mAh
Capacity1100mAh
Rate4.18Wh
Net Weight18.2g /0.64 oz
Gross Weight43.2g /1.52 oz
Approximate Weight43.2g /1.52 oz
Dimension 67.54 x 32.80 x 3.60mm

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 Oasis 3 shows low battery immediately after fitting the new cell — is it faulty?

It is not faulty. Replacement Li-Polymer cells ship at storage voltage, which the Oasis 3 firmware reads as a near-empty state. Plug in via USB-C and charge fully to 100% before drawing any conclusions. Once the cell reaches a full charge, the percentage display will stabilise.

Battery percentage on my Oasis 3 jumps around randomly after the swap — 80% one minute, 45% the next.

This is the firmware's coulomb counter recalibrating to the new cell. The counter was tuned to the old cell's charge curve, so it misreads the new one until it has a full reference cycle. Charge the device to 100%, use it until it drops to around 20%, then charge fully again. After that cycle, the percentage readings settle.

WiFi sync is draining the Oasis 3 battery noticeably faster than just reading — is something wrong with the replacement cell?

Nothing is wrong with the cell. The Oasis 3 WiFi radio draws significantly more current than the e-ink display alone — the display only refreshes on a page turn and idles at very low current between refreshes. WiFi holds a continuous radio connection that pulls current constantly. Turn off WiFi when not actively syncing and the battery drain will drop sharply back to the low levels you expect from an e-ink device.

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