Audioline CDL935G Replacement Battery 3.6V 700mAh

Audioline CDL935G — 3.6V Ni-MH Replacement Battery (10245-10544)

This is a 3.6V, 700mAh Ni-MH battery for the Audioline CDL935G cordless telephone handset. It replaces OEM part number 10245-10544. The battery slides into the handset battery compartment and connects to the same contacts as the original pack.

• CDL935G handset fit: The CDL935G uses a single-cell Ni-MH pack running at 3.6V nominal. The contact orientation, physical dimensions (43 × 31 × 8mm), and voltage rating match what the base station's charging circuit expects. Swap in anything outside that voltage band and the base will not register a charge cycle.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a DECT handset test rig. The BMS accepted charge current from a standard CDL-series base station without triggering a fault light. Capacity climbed across the first three cycles, which is normal Ni-MH behaviour.
• First-charge conditioning on Ni-MH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before the first call. Ni-MH cells in cordless phones reach rated capacity only after a slow initial charge — skipping this step leaves usable capacity well below 700mAh from day one.

Base station showing no charge or a fault light after swapping the battery

When a Ni-MH pack sits in a warehouse, self-discharge pulls the cell voltage down — sometimes below 3.0V. The CDL935G base station uses a delta-V detection circuit to confirm a valid battery is present before starting a charge cycle. A deeply discharged pack can fall below the detection threshold, so the base reads it as absent or faulty. Leave the handset in the base undisturbed for 30–60 minutes. Most base stations will trickle-charge the pack back above 3.2V, at which point normal CC/CV charging resumes and the fault light clears.

Range drops noticeably mid-call after fitting the new battery

DECT handsets draw a sharp current spike every time the RF module transmits a burst. If the battery voltage sags under that load — common in the first few cycles before Ni-MH cells are conditioned — the transmit power drops and effective range shrinks. This is not a handset fault or a pairing issue. Run three full charge-and-use cycles without topping up mid-call. By cycle four, internal resistance falls and the voltage holds steadier under RF load, restoring normal range.