Audioline CDL200 Replacement Battery 3.6V 600mAh

Audioline CDL200 / CDL400 / FF893 — 3.6V Ni-MH Replacement Battery

This is a 3.6V 600mAh Ni-MH rechargeable battery for the Audioline CDL200, CDL400, and FF893 cordless handsets. It slots into the battery compartment and powers the handset away from the base station. No OEM part number exists for this battery — compatibility is confirmed by voltage, chemistry, and physical dimensions (42.45 × 29.77 × 14.37mm).

• CDL200, CDL400, and FF893 compatibility: These three Audioline handsets share the same battery bay dimensions and 3.6V NiMH charging circuit. The base station charges at the same trickle rate across all three, so one battery format covers the full range.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the CDL200 base station. The BMS accepted charge without error and the handset powered on cleanly across three consecutive cycles.
• First-charge protocol for NiMH cordless handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cells ship in a partially discharged state — a slow first charge lets the cells reach rated capacity. Skipping this step is the leading cause of short talk time after a fresh install.

Base station showing no charge or error light after fitting a new NiMH pack

NiMH cells lose voltage during storage. If the cell voltage drops low enough, the CDL200 base station's charging circuit may not recognise the battery as a valid pack and will stall before initiating a charge cycle. This is not a fault with the battery or the base — it is a voltage threshold issue. To recover, remove the battery, short the terminals briefly with a resistor or low-load device to bring the voltage to a stable low point, then re-seat it in the base. Most base stations will then begin a normal charge cycle from around 3.0V upward.

Range drops noticeably when the handset moves away from the base

DECT handsets draw a short burst of power each time the radio transmits. If the NiMH cell is not fully conditioned, its internal resistance is higher than normal and voltage sags under that RF load. The handset interprets the sag as a low-battery state and reduces transmit power, cutting range. Running three to five full charge-discharge cycles brings internal resistance down and restores stable voltage under load. After conditioning, range returns to the level the base station supports.