Binatone MD500 Cordless Phone Replacement Battery 2.4V 1200mAh

Binatone MD500 Series — 2.4V Ni-MH 1200mAh Replacement Battery

This is a 2.4V, 1200mAh Ni-MH battery pack for Binatone cordless DECT phones including the MD500, MD-500, Big Button Combi, and Micro DECT compatible handsets. It replaces the original rechargeable cell that powers the handset away from the base station. When the original pack no longer holds a charge, swapping it restores normal cordless operation.

• MD500 and Micro DECT handset fit: These models share the same 2.4V two-cell NiMH pack configuration, connector pinout, and physical footprint — 50.25 × 28.09 × 14.41mm. The base station charges at a voltage rail matched to this chemistry, so no adapter or modification is needed.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a NiMH-compatible analyser. The BMS accepted charge current without rejection, and cell voltage held within spec across repeated cycles with no thermal anomaly.
• First charge after installation: Place the handset in the base for a full 16 hours before first use. NiMH cordless phone packs shipped in storage discharge and need a slow full charge to reach rated capacity — a short first charge will leave the cells underformed.

Base station charge indicator not lighting after fitting a new NiMH pack

NiMH batteries lose voltage during storage. If the resting voltage drops far enough, the base station's charge circuit may not recognise the pack as a valid load and will show no charge light or an error state. This is not a fault with the battery or the base. Seat the handset firmly in the cradle and leave it for 30–60 minutes — once the trickle stage raises the pack above approximately 2.0V, the base will switch to normal charging mode and the indicator will activate.

Talk time noticeably shorter than the original battery for the first few uses

A new NiMH cell does not deliver full rated capacity on the first cycle. It typically takes three to five full charge-discharge cycles before the cells reach 1200mAh. Using the handset until it beeps low, then returning it to the base for a complete charge each time, works through this conditioning faster. By cycle five, talk time should match or exceed what the worn original pack provided.