Sagem Mistral 3.6V Cordless Phone Compatible Battery 700mAh

Sagem Mistral Series — 3.6V Ni-MH Replacement Battery

This is a 3.6V 700mAh Ni-MH replacement battery for the Sagem Mistral cordless DECT phone range, including the Mistral 20, Mistral 200, and Mistral 10-200. It fits directly into the handset battery compartment and restores full wireless operation when the original cell no longer holds a charge.

• Mistral handset compatibility: The Mistral, Mistral 20, Mistral 200, and Mistral 10-200 all share the same 3.6V single-cell Ni-MH pack format with the same connector orientation and physical footprint — 45 × 36 × 10mm. No modification is needed to fit.
• Bench tested on actual hardware: We cycled this pack through the Mistral base station and confirmed the BMS accepted the charge without error, reaching full voltage across three discharge-charge cycles.
• First-charge protocol for Ni-MH handsets: Place the handset in the base for a full 16-hour charge before first use. Ni-MH cordless phone cells require a slow initial charge to reach rated 700mAh capacity — cutting it short leaves the cell conditioned well below spec.

Range drops after fitting a new Ni-MH pack in the Mistral

DECT handsets regulate transmit power against available supply voltage. A new Ni-MH cell that hasn't completed its first conditioning cycle will sag under the RF load the radio module draws during a call. That voltage sag causes the handset to reduce transmit power, which shortens effective range. Run three full charge-discharge cycles and the cell's internal resistance drops — voltage sag reduces and range stabilises back to normal.

Base station shows no charge or error light after fitting replacement battery

Ni-MH cells stored before sale self-discharge to a resting voltage the Mistral base may read as below its acceptance threshold. The base station's charge circuit expects to see a cell above roughly 3.0V before it initiates the charge cycle. If the indicator stays off or shows an error, remove the handset, wait 10 seconds, and re-seat it firmly — this resets the base handshake. If that doesn't clear it, confirm cell voltage with a multimeter; anything above 2.8V will respond to a slow trickle charge started by a firm re-seat.