Kyocera KX13 Replacement Battery 3.7V 1400mAh TXBAT10073

Kyocera KX13 / KX16 / KX160 Series — 3.7V Li-ion Replacement Battery (TXBAT10073)

This is a 3.7V, 1400mAh Li-ion replacement battery for the Kyocera KX13, KX16, KX160, and KX12 series mobile phones. It fits the OEM slot using part number TXBAT10073 and restores power to devices where the original cell has degraded or failed. Capacity is 5.18Wh — matching the original spec.

• KX-series shared platform: The KX13, KX16, KX160, and KX12 share the same battery bay geometry, voltage rail, and connector pinout. One cell fits all of them because Kyocera standardised the power interface across this lineup — same BMS handshake, same charge termination voltage.
• Bench tested on actual hardware: We cycled this cell on KX-series hardware and confirmed the BMS accepted charge without fault codes, hit full termination voltage at 4.2V, and held load through screen-on and call simulation without voltage sag triggering an early cutoff.
• Fuel gauge recalibration on first install: On first use after fitting this cell, run one full discharge-charge cycle with fast charging disabled. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter — preventing erratic percentage readings from the first charge onward.

Sudden shutdown at 20–30% on the KX13 after a cell swap

This is a voltage cliff problem, not a capacity problem. When the modem fires or the screen ramps brightness, instantaneous current draw spikes — and a new cell with an uncalibrated fuel gauge IC can hit the BMS undervoltage threshold before the reported percentage reflects it. The phone shuts down to protect the cell even though the display showed charge remaining. Run one full discharge cycle to 0% (let it shut off naturally), then charge to 100% without interruption — this resets the coulomb counter baseline and brings the reported percentage in line with actual cell state.

KX-series phone not powering on after sitting in storage with a flat battery

If the cell discharged below 2.5V during storage, the BMS enters lockout mode and blocks standard charge input. Plugging in a charger produces no response — no charging LED, no boot. Connect the phone to a low-current USB source (a computer port, not a wall adapter) for 15–20 minutes. This trickle-feeds enough current past the BMS threshold to lift cell voltage above 3.0V, at which point the BMS re-initialises and normal charging resumes. Once the LED confirms charging, switch to a wall adapter to complete the cycle.