About this replacement
Kyocera DuraSport 5G UW / C6930 — 3.87V Li-Polymer Replacement Battery (5AAXBT141GEA)
This is a 3.87V, 3500mAh Li-Polymer cell that replaces the original battery in the Kyocera DuraSport 5G UW and C6930 smartphones. It fits both OEM part numbers 5AAXBT141GEA and SCP-75LBPS. Use it when the original cell no longer holds a charge through a normal day of calls, messaging, and app use.
- DuraSport 5G UW and C6930 fit: Both models run the same battery bay, connector pinout, and BMS handshake protocol. The voltage rail and cell format are identical across the two variants, so one cell covers both.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a DuraSport 5G UW unit. The BMS accepted the new cell without fault codes, and the fuel gauge IC completed its initial calibration pass without interruption.
- First-cycle fast charge disable: On first use after installation, turn off fast charging in the device settings and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.
Sudden shutdown at 20–30% on a replacement cell
This happens because the fuel gauge IC inside the DuraSport is still running a discharge curve calibrated to the old, degraded cell. When the new cell voltage drops under modem or screen load, it hits a point the IC reads as critical cutoff — even though the cell has remaining capacity. The phone shuts down to protect what it thinks is a near-empty battery. One full discharge-charge cycle at standard rate resets the coulomb counter and maps the new cell's actual voltage floor. After that cycle, shutdowns at 20–30% should stop.
USB-PD fast charge not activating after replacement
After a cell swap, the BMS on the new battery needs to complete one standard charge handshake before it will negotiate the USB-PD fast charge protocol with the phone's charge IC. On the first cycle, the charger defaults to standard 5V input because the BMS has not yet validated its internal temperature and voltage flags. Plug in using a standard 5W charger for the first full charge cycle. On the second cycle, reconnect your fast charger — the BMS will now accept the higher voltage negotiation and fast charging will resume normally.