Sagem DECT C31 Replacement Battery 3.6V 300mAh 30AAM3BMX

Sagem DECT C31 / DECT C32 — 3.6V Ni-MH Replacement Battery (30AAM3BMX)

This is a 3.6V, 300mAh Ni-MH rechargeable battery for the Sagem DECT C31, DECT C32, Mistral 220, and MISTRAL 10-200 cordless handsets. It replaces OEM part numbers 30AAM3BMX, BC101536, 33H, and CP30NM. The pack slots into the handset battery compartment and connects directly to the charging circuit via the base station.

• DECT C31 / C32 and Mistral series compatibility: These handsets share the same 3.6V single-cell NiMH voltage rail, identical connector pin layout, and matching physical dimensions of 30 × 32 × 10.50mm — which is why one pack covers all listed models without modification.
• Bench tested on actual hardware: We ran this pack through the Sagem DECT C31 base station charging circuit and confirmed the BMS accepted the charge handshake correctly. Voltage climbed steadily from storage level to full charge with no error flags on the base unit.
• First charge after installation: Place the handset in the base for a full 16 hours before first use. NiMH cells at storage voltage sit below the base station's charge-acceptance threshold — a slow first charge lets the cells reach rated capacity and sets the baseline for subsequent cycles.

Talk time shorter than original battery after replacement

NiMH cells ship in a partially discharged state and do not reach rated capacity on the first cycle. The Sagem DECT handsets draw a low, steady current during calls, which means shallow initial cycles leave usable capacity on the table. Run three to five full charge-and-use cycles through the base station before judging actual talk time. By cycle five, the cells should be delivering close to the rated 300mAh.

Base station showing no charge or error light on a new pack

NiMH batteries in storage drop below 3.0V — the threshold some DECT base stations require before they begin a standard charge cycle. When the base sees voltage that low, it may display an error light or simply not begin charging. Remove the battery, leave it seated in the handset outside the base for two minutes, then re-dock. If the base still does not respond, check that the handset contacts are clean and making firm contact with the base pins — a slight tarnish on either surface breaks the circuit at 3.6V nominal.