SBC 368B Cordless Phone Replacement Battery 3.6V 1500mAh

SBC 368B — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 1500mAh Ni-MH replacement battery for the SBC 368B cordless phone handset. It slots into the battery compartment in the handset body and powers the DECT radio, speaker, and display. Capacity figure is from the product specification — 5.4Wh total energy.

• SBC 368B handset fit: The 368B uses a 3.6V single-cell Ni-MH pack sized at 49.00 × 42.90 × 14.74mm. This replacement matches that voltage rail and physical footprint. The handset charging circuit expects Ni-MH chemistry — a Li-ion pack at the same voltage would behave differently under trickle charge and should not be substituted.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a Ni-MH-capable tester. The BMS accepted trickle charge from the base station without flagging an error. Capacity reached rated output after three full conditioning cycles, which is normal behaviour for Ni-MH cells from storage.
• First charge on the 368B: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cordless phone packs arrive partially discharged from storage. A slow first charge lets the cells reach rated capacity — skipping this step will result in shorter talk time on the first few uses.

Range reduction on the 368B after a battery swap

Ni-MH voltage drops under RF load — the DECT transmitter in the 368B draws a short current spike every time it sends a signal burst to the base. A fresh pack straight from storage sits at a lower state of charge, so that voltage sag is larger than it would be on a fully conditioned cell. The handset interprets sustained low voltage as a weak battery and may reduce transmit power or drop the link. Run three full charge-discharge cycles and the resting voltage stabilises, which keeps the transmit rail within spec during peak draw.

Base station shows no charge light after fitting new battery

Ni-MH packs shipped from storage can sit below 3.0V, which is under the acceptance threshold some 368B base charger circuits use to detect a valid pack. The base sees the low voltage and withholds charge rather than risk reverse-polarity damage to a deeply discharged cell. Remove the handset, wait 10 seconds, then reseat it firmly — the base retries detection on each insertion. If the charge light still does not appear, check that the handset contacts and base cradle contacts are clean and making full metal-to-metal contact; a thin film of oxidation raises contact resistance enough to drop the detected voltage below 3.0V.