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Amazon Kindle Oasis 58-000117 Replacement Battery 3.7V 240mAh

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From $28.99 USD $35.99
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Fits Amazon Kindle Oasis models KO1, 223337, SW56RW and others using OEM part 58-000117.
3.7V and 240mAh capacity powers the e-ink display and wireless connectivity on this e-reader without compromise.
Connector type is proprietary to Kindle Oasis; physical fit confirmed against the internal battery slot and retention tabs.
We bench-tested this Li-Polymer cell at full charge into a KO1 unit — BMS accepted the cell and delivered stable voltage under display refresh cycles.
After installation, charge via USB-C for a full cycle before reading — Kindle firmware requires complete charge to calibrate 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.

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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

240mAh

Amazon Kindle Oasis — 3.7V Li-Polymer Replacement Battery (58-000117)

This is a 3.7V, 240mAh Li-Polymer replacement battery for the Amazon Kindle Oasis e-reader (models KO1, 223337, SW56RW and related variants). It fits the original cell slot and connects to the same BMS interface as the factory unit. Part number 58-000117 confirms the correct cell for this specific Kindle generation.

  • Kindle Oasis KO1 and 223337 compatibility: These models share the same 3.7V cell footprint, connector pinout, and BMS communication protocol — the firmware reads charge state and temperature data from the same register set across all listed variants.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Kindle Oasis platform. The BMS accepted the cell without fault codes, and charge percentage reporting stabilised after one complete cycle.
  • Post-swap charge cycle for Kindle Oasis: After installing, connect via the Kindle's USB cable and charge without interruption until the indicator confirms full charge. The Oasis firmware recalibrates its fuel gauge to the new cell during this first uninterrupted cycle — skipping it causes the percentage display to jump erratically.

Why the Kindle Oasis shows low battery immediately after a new cell

Replacement cells ship at storage voltage — typically 3.6V or below — not at a full 4.2V charge. The Kindle Oasis firmware reads this low resting voltage and flags it as a depleted battery before you even power on. This is not a cell defect. Connect to USB power immediately after installation and allow a full uninterrupted charge cycle before drawing any conclusions about capacity.

Battery percentage jumping around after the swap

The Oasis fuel gauge IC stores calibration data tied to the original cell's charge curve. When a new cell is installed, those stored values no longer match the actual charge state, so the displayed percentage reads inconsistently. The firmware recalibrates automatically, but only during a full charge-to-discharge cycle. Run one complete cycle — charge to 100%, use until the device prompts for charge — and the percentage display will stabilise at that point.

Compatible Models

Kindle Oasis KO1 223337 SW56RW Oasis 1 Oasis 2 Oasis 3

Replaces Part Numbers

58-000117

Technical Specifications

Voltage3.7V
Amp Hours240mAh
Capacity240mAh
Rate0.89Wh
Net Weight6g /0.21 oz
Gross Weight31g /1.09 oz
Approximate Weight31g /1.09 oz
Dimension 40.00 x 32.80 x 2.20mm

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 won't turn on after I swapped the battery — is the new cell dead?

Almost certainly not. The replacement cell ships at storage voltage, often around 3.6V, which can sit below the Oasis boot threshold. Connect the Kindle to its USB charger and leave it for at least 10 minutes before pressing the power button. Once the cell climbs above the minimum boot voltage — approximately 3.7V — the device will power on normally.

The page turns feel sluggish since I replaced the battery — what's causing that?

E-ink displays draw a short voltage pulse to refresh each page. When the cell voltage is low or the fuel gauge is still recalibrating after a swap, that refresh pulse takes longer to complete, and the turn feels delayed. Charge the device fully and run one complete charge cycle. If sluggishness persists after the cell reaches 4.2V, check that the battery connector is fully seated — a partial connection raises internal resistance and mimics a low-voltage condition.

WiFi is draining the Kindle Oasis battery far faster than it used to — is something wrong with this cell?

WiFi draw on the Oasis is significantly higher than display-only use — it's the single largest drain on this platform. After a cell swap, the fuel gauge recalibration period can make the battery appear to drain faster than it actually is. Turn WiFi off between sync sessions using the quick-access menu and allow two or three full cycles to complete before assessing real-world drain. If the concern persists, check sync settings — automatic book delivery with frequent check-ins keeps the radio active longer than manual sync does.

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Amazon Kindle Oasis Replacement Battery, 3.7V, 240mAh, Li-Polymer 1

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