Cobra CP471 Cordless Phone Compatible Battery 3.6V 400mAh

Cobra CP471 / CP472 / CP473 / CP474 Series — 3.6V Ni-MH Replacement Battery

This is a 3.6V 400mAh Ni-MH replacement battery for Cobra cordless phone models CP471, CP472, CP473, and CP474. It fits the handset battery compartment and restores power to the cordless unit. Voltage and form factor match the original pack at 49.60 x 33.62 x 6.70mm.

• CP471–CP474 shared platform: These four Cobra models run on the same 3.6V single-cell Ni-MH architecture and use the same handset battery bay. The voltage rail, cell count, and connector position are identical across the range, so one pack covers all four.
• Bench tested on actual hardware: We cycled this battery through the CP471 handset and confirmed the base station accepted the charge state without error. The BMS on these phones is simple — it charges by voltage threshold, so the cell quality matters more than handshake logic.
• First charge on Ni-MH handsets: Place the handset in the base for a full 16 hours before first use. Ni-MH cells at storage charge sit below rated capacity. The slow overnight charge lets the cells reach their full 400mAh before you start cycling them.

Range dropping mid-call after a battery swap

The CP471 transmitter draws a sharp burst of current when maintaining DECT signal at distance. A Ni-MH cell that hasn't been conditioned will sag in voltage under that RF load. When voltage dips below roughly 3.2V under load, the handset reduces transmit power or drops the call. Run three to five full charge and discharge cycles first — range stabilises once the cells reach rated capacity.

Handset not pairing with base after battery replacement

Removing the battery on some Cobra DECT handsets wipes the stored pairing data — the phone loses its link to the base entirely. This is not a battery fault. Re-register the handset using the base station pairing button, which is usually held for three seconds until the base indicator flashes. Once paired, the handset reconnects at full power.