About this replacement
AudioVox CDM-8915 — 3.7V Li-ion Replacement Battery (BTR-8915)
This is a 3.7V, 1600mAh Li-ion replacement battery for the AudioVox CDM-8915 mobile phone. It replaces OEM part numbers BTR-8915 and BLI-994-8. Capacity is 5.92Wh — matched to the original cell specification for this handset.
- CDM-8915 fitment: The CDM8915 uses a single-cell 3.7V Li-ion pack with a dedicated connector keyed to this form factor. Both listed OEM part numbers share the same voltage rail and physical footprint — this cell fits both variants without modification.
- Bench tested on actual hardware: We ran the cell through charge and discharge cycles on the CDM-8915 platform. The BMS accepted the charge controller handshake on the first cycle, and protection circuitry triggered correctly at low-voltage cutoff — no false trips under call or screen load.
- Fuel gauge recalibration on first use: On first install, disable any fast-charge mode and run one complete discharge-to-charge cycle. The phone's fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve — skipping this step causes the percentage readout to drift or jump erratically for the first several days.
Sudden shutdown at 20–30% on the CDM-8915 after a cell swap
This happens because the fuel gauge IC is still running the discharge curve from the old, degraded cell. When the new cell hits a voltage point the old curve didn't map accurately, the OS reads a false zero and cuts power. The phone shuts down even though usable charge remains. One full discharge-to-charge cycle forces the coulomb counter to relearn the new cell's voltage-capacity curve, and the shutdowns stop. After calibration, the cell should hold voltage above 3.6V at the point the phone previously cut out.
Phone feels warm near the battery during the first charge cycle
A fresh Li-ion cell has slightly higher internal impedance than a cell that has been cycled several times. The charge IC pushes current into that higher impedance, and the heat is a normal byproduct of the first cycle — not a fault. Warmth should stay moderate and reduce noticeably by the second charge. If the phone becomes hot to the touch or the charge IC shuts down mid-cycle, stop charging and check that the connector is fully seated — a partial connection forces the IC to work harder and raises current draw on the contact points.