Philips CP-350AUS Cordless Phone Compatible Battery 3.6V 600mAh

Philips CP-350AUS — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 600mAh Ni-MH replacement battery for the Philips CP-350AUS cordless DECT handset. It fits the original battery slot and connector directly. Use it when your handset no longer holds a charge or dies faster than it used to.

• CP-350AUS fit: The CP-350AUS runs a standard 3.6V Ni-MH cell pack at 600mAh — the same voltage rail and physical form factor as the original Philips factory pack. The connector orientation and cell dimensions (42.45 × 29.77 × 14.37mm) match the handset battery bay without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a DECT handset platform. The Ni-MH cells accepted a full slow charge from the base station cradle and the BMS showed no fault flags across the first three conditioning cycles.
• First-charge protocol for Ni-MH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cordless phone packs ship in a partially discharged state — a slow initial charge is what lets the cells reach rated capacity.

Base station showing no charge light on a new Ni-MH pack

Ni-MH cells can sit in warehouse storage for months and drop below the voltage threshold the base station uses to confirm a valid battery is present. If the charge indicator stays dark after you install the new pack, the resting voltage is likely too low for the base to begin its charge cycle. Remove the handset, wait 60 seconds, and reseat it firmly — some DECT base stations need to re-detect the battery. If the indicator still doesn't activate, check the contacts on the handset are clean and making full contact with the cradle pins.

Talk time shorter than expected after the first few charges

Ni-MH cells don't deliver full rated capacity on cycle one — this is normal cell chemistry, not a faulty battery. Capacity builds over the first three to five full charge-discharge cycles as the cell chemistry stabilises. Run the handset down to the low-battery warning, then do a full 16-hour charge in the base, and repeat this two more times. By cycle four, the pack should be delivering close to the rated 600mAh.