Clarity BT184342 Cordless Phone Replacement Battery 2.4V 700mAh

Clarity 50613.002 / D603 / D613 Series — 2.4V Ni-MH Replacement Battery (BT184342)

This is a 2.4V 700mAh Ni-MH battery replacing OEM part numbers BT184342, BT284342, and BY0929. It fits Clarity cordless phone models including the 50613.002, D603, D613, and D613C. Install it when the original pack no longer holds a charge and the handset dies faster than expected.

• Clarity D603 / D613 / 50613.002 handsets: These models share the same 2.4V two-cell NiMH pack format, identical connector pinout, and the same base station charging circuit. One battery fits across the range without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a compatible Clarity base station. The BMS accepted charge from the first cycle, and cell voltage held within spec across repeated draws under simulated talk and standby loads.
• First-charge protocol for NiMH cordless handsets: After installing, seat the handset in the base for a continuous 16-hour charge before first use. NiMH cells in cordless phones are shipped partially discharged — skipping this slow initial charge leaves capacity on the table for the first several cycles.

Base station charging error light on a fresh NiMH pack

Clarity base stations use a delta-V detection circuit to confirm charge acceptance. A new or stored NiMH battery can arrive with cell voltage low enough that the base reads the pack as faulty and throws an error light instead of charging. This is a voltage threshold issue, not a defective battery. To clear it, hold the handset in the cradle for two to three minutes, remove it, and reseat it — this forces the base to re-sample cell voltage. If the error persists, measure cell voltage at the battery terminals; any reading above 1.8V total means the base will eventually accept the pack.

Talk time shorter than the original battery after replacement

NiMH cordless phone batteries do not reach rated capacity on the first cycle — 700mAh is the figure after three to five full charge and discharge cycles. Out of the box, the first cycle typically delivers 60–70% of that figure. Each subsequent full cycle conditions the cells and recovers more capacity. Run three complete charge and discharge cycles before judging talk time — cycle four is usually where the battery stabilises at or near rated 700mAh output.