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Amazon Kindle Fire 7 5th Gen Replacement Battery MC-308594 3.7V 3000mAh

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Fits Amazon Kindle Fire 7 5th Generation tablets; replaces OEM part MC-308594 battery.
3.7V, 3000mAh lithium-polymer cell delivers full charge cycles to the Kindle Fire 7 display and WiFi stack.
Connector mates flush to the internal battery slot with no locking tab; orientation marked on circuit board.
We bench-tested this cell in a Fire 7 5th Gen; BMS accepted the pack on first charge cycle without fault codes.
After installation, run one full discharge to automatic shutoff then charge uninterrupted to 100% — this resets the fuel gauge calibration against the new cell.
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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

3.7V

Amp

3000mAh

Amazon Kindle Fire 7 5th Gen — 3.7V Li-Polymer Replacement Battery (MC-308594)

This 3.7V, 3000mAh (11.1Wh) lithium-polymer battery replaces part MC-308594 in the Amazon Kindle Fire 7 5th Generation (SV98LN). It fits the compact tablet used for reading, streaming, and everyday tasks. Dimensions are 98.00 × 84.00 × 2.60mm — measure your original before installing.

  • Kindle Fire 7 5th Gen (SV98LN) fit: Both the Kindle Fire 7 5th Gen and its SV98LN variant share the same board layout, connector pinout, and charge-controller handshake — this cell slots into either without modification.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Fire 7 5th Gen unit. The charge IC accepted the new cell cleanly, BMS protection tripped correctly at the low-voltage threshold, and the board reported state-of-charge without fault flags.
  • Fuel gauge recalibration after swap: After installation, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. This forces the fuel gauge IC to map its thresholds against the new cell and clears the percentage-reading errors that commonly appear after a battery swap.

Kindle Fire 7 shutting down at 15–25% remaining after a battery swap

The Fire 7's fuel gauge IC retains calibration data from the old, degraded cell. When the replacement cell hits a voltage that the old calibration maps to 15–25%, the board misreads it as critically low and triggers a shutdown. The display backlight and WiFi radio together pull enough current to accelerate this voltage cliff. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% resets the calibration and moves the shutdown point back to the correct threshold near 3.0V per cell.

Fire 7 battery percentage jumping or reading 0% immediately after replacement

A freshly installed cell has no charge history that the fuel gauge IC recognises, so the tablet can report 0%, freeze on a percentage, or jump erratically between readings. This is a calibration issue, not a faulty battery. Plug directly into a wall adapter — not a PC USB port — and charge without interruption until the status indicator shows full. If the percentage still reads incorrectly after one full charge, complete a single full discharge cycle and recharge to 100% to complete the recalibration.

Compatible Models

Kindle Fire 7 5Tth Gen SV98LN

Replaces Part Numbers

MC-308594

Technical Specifications

Voltage3.7V
Amp Hours3000mAh
Capacity3000mAh
Rate11.1Wh
Net Weight54.2g /1.91 oz
Gross Weight89g /3.14 oz
Approximate Weight89g /3.14 oz
Dimension 98.00 x 84.00 x 2.60mm

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 7 shows the wrong battery percentage after I put in the new battery — is the replacement defective?

The replacement cell is almost certainly fine. The fuel gauge IC on the Fire 7 board stores calibration data tied to the old cell's discharge curve, and a new cell confuses it immediately. Charge the tablet uninterrupted to 100% from a wall adapter, then let it drain completely to automatic shutoff. That one full cycle gives the IC enough data to remap its thresholds against the new cell, and the percentage display stabilises.

My Kindle Fire 7 dies suddenly at around 20% after the battery swap — why?

The Fire 7's charge controller still has voltage-to-percentage mapping from the degraded original cell baked in. When the new cell hits a voltage the old map reads as critical, the board shuts down even though real capacity remains. The display and WiFi drawing simultaneous current steepens this voltage drop and triggers the cutoff early. Run one full discharge to automatic shutoff, then charge uninterrupted to 100% — after that cycle the shutdown threshold shifts back to approximately 3.0V, where it belongs.

The Kindle Fire 7 feels warm while charging the new battery — should I be concerned?

Mild warmth during the first few charge cycles on a new cell is normal. The charge IC is negotiating current delivery with an unfamiliar cell for the first time, and the new cell's internal resistance is slightly higher than a broken-in one, generating a small amount of extra heat. If the tablet becomes too hot to hold comfortably or the charge stops before reaching 100%, disconnect it and let it cool for 30 minutes before resuming. Charging on a hard flat surface rather than a cushion or case keeps airflow open and keeps temperatures in range.

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