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Amazon Kindle Paperwhite 4 ST22 Replacement Battery 3.8V 1500mAh

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Fits Amazon Kindle Paperwhite 4 2018 with OEM part number ST22.
Supplies 3.8V at 1500mAh capacity — adequate reserve for full e-reader cycles on WiFi and backlight combined.
Connector is a two-pin proprietary slot; battery seats flush against the rear panel with no locking tab required.
We bench tested this cell in a PQ94WIF unit; the BMS accepted charge without fault codes and held 3.7V after two weeks shelf rest.
After installation, discharge fully to automatic shutoff then charge uninterrupted to 100% — this recalibrates the fuel gauge IC against the new cell 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.

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

3.8V

Amp

1500mAh

Amazon Kindle Paperwhite 4 2018 — 3.8V Li-Polymer Replacement Battery (ST22)

This 3.8V, 1500mAh Li-Polymer battery replaces the original ST22 cell in the Amazon Kindle Paperwhite 4 (10th Generation, 2018). It fits the PQ94WIF board variant and matches OEM references 58-000246 and 58-000271. If your Paperwhite drains overnight on standby or won't hold charge through a reading session, this cell addresses a degraded original battery.

  • Paperwhite 4 and 10th Gen compatibility: These model designations share the same board layout, connector orientation, and BMS handshake protocol — all confirmed against the ST22 footprint at 70 × 66 × 2.60mm. No connector adapters needed.
  • Bench tested on actual hardware: We ran the cell through charge and discharge cycles on a Paperwhite 4 unit. The charge IC accepted the cell without error flags, BMS cutoff triggered correctly at low voltage, and capacity readout stabilised after one full cycle.
  • Fuel gauge recalibration after install: After fitting this battery, let the Paperwhite discharge to automatic shutoff — don't force it off — then charge uninterrupted to 100% without using the device. That single cycle resets the fuel gauge IC against the new cell and eliminates the incorrect percentage readouts that appear immediately after a swap.

Kindle Paperwhite shutting down between 15% and 25% remaining

The Paperwhite's fuel gauge IC learns the voltage-to-capacity curve of the original cell over time. A new cell has a slightly different discharge curve, so the IC miscalculates the remaining capacity and triggers shutdown too early. This is not a fault with the replacement cell. Running one complete discharge-to-shutoff followed by a full uninterrupted charge corrects the stored curve. After that cycle, the device should reach 0% before shutting down.

Paperwhite showing incorrect battery percentage immediately after swap

The onboard fuel gauge IC retains calibration data from the old degraded cell. When a new cell is installed, the stored data no longer matches the actual cell state, so the percentage reading is unreliable — often jumping or reading high while the device still shuts down unexpectedly. The fix is a recalibration cycle: discharge fully to automatic shutoff, then charge to 100% without interruption. Check the percentage at 3.8V open-circuit — if it reads close to 100%, calibration has completed correctly.

Compatible Models

Kindle Paperwhite 4 2018 Kindle Paperwhite 10th Generation Kindle Paperwhite 4 10th Generation 2018 PQ94WIF

Replaces Part Numbers

ST22 58-000246 58-000271 MC-266767

Technical Specifications

Voltage3.8V
Amp Hours1500mAh
Capacity1500mAh
Rate5.7Wh
Net Weight28g /0.99 oz
Gross Weight53g /1.87 oz
Approximate Weight53g /1.87 oz
Dimension 70.00 x 66.00 x 2.60mm

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 Paperwhite shows 40% battery but shuts off immediately — is the new battery faulty?

The cell is not faulty. The fuel gauge IC on the Paperwhite board is calibrated to the old degraded cell, so percentage readings are inaccurate until recalibration. Let the device discharge to automatic shutoff without forcing it off, then charge uninterrupted to 100%. That single cycle resets the IC against the new cell's voltage curve, and the percentage will track correctly from there.

The battery percentage on my Paperwhite 4 drops from 100% to 60% within the first hour after fitting a new battery — why?

This is fuel gauge drift — the IC is reading a stored capacity curve that doesn't match the new cell, so early percentage drops look steeper than the actual state of charge. The cell still holds full capacity; the display just hasn't caught up. Run one full discharge to automatic shutoff and then a complete uninterrupted charge to 100%. After that cycle, the reported percentage will match actual remaining charge.

My Paperwhite feels warm near the bottom while charging the new battery — should I be concerned?

Mild warmth during the first few charge cycles on a new Li-Polymer cell is normal. The charge IC runs at a slightly higher current draw while the cell is forming and the fuel gauge is learning the new charge curve. If the device becomes hot to the touch or charging stops mid-cycle, disconnect and check that the connector is fully seated flat. Normal charging warmth resolves after the first complete cycle, when the charge IC settles into its steady-state profile.

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