About this replacement
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.