AudioVox BTR-8945 Replacement Battery 3.7V 950mAh Li-ion

AudioVox CDM-8945 / PN-230 — 3.7V Li-ion Replacement Battery (BTR-8945)

This is a 3.7V Li-ion battery rated at 950mAh (3.52Wh), built to the BTR-8945 specification. It fits the AudioVox CDM-8945, PN-230, PM-230, and the Telit V230 — all share the same voltage rail and connector footprint. Install it and the phone returns to full call, messaging, and standby function.

• CDM-8945, PN-230, PM-230, and Telit V230 fitment: These four models draw from the same BTR-8945 cell spec — identical 3.7V nominal rail, same connector orientation, and compatible BMS handshake. One battery covers all four without modification.
• Bench tested on actual hardware: We cycled this cell through charge, load, and cutoff verification. The BMS held low-voltage cutoff correctly and accepted a full charge without thermal event or premature termination.
• Fuel gauge recalibration after swap: On first use, disable any fast-charge accessory and run one complete discharge-charge cycle at standard current. This lets the phone's fuel gauge IC map its algorithm to the new cell's discharge curve before higher charge currents are applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the CDM-8945 after a cell swap

The CDM-8945 uses a coulomb-counter fuel gauge that was calibrated against the original cell's impedance curve. A new cell has lower internal resistance, so the gauge's voltage model diverges from real state-of-charge under GSM modem load bursts. When the modem transmits, current draw spikes and the cell voltage dips briefly below the shutdown threshold — even though capacity remains. One full discharge-charge cycle resets the learned curve and the shutdowns stop.

Phone won't power on after the battery sat in storage

Li-ion cells self-discharge during storage. If the cell drops below roughly 2.5V, the BMS trips into lockout to prevent damage and the phone shows no response to the power button. Connect the phone to a wall charger — not a USB port — and leave it undisturbed for 20–30 minutes. The charge IC will trickle current into the cell until it clears the lockout threshold, after which normal charging resumes. If the phone still shows no sign of charge after 45 minutes, confirm the charger is delivering at least 5V before assuming a fault.