COMfortel M-200 Cordless Phone Replacement Battery 3.7V 950mAh

COMfortel M-200 / M-210 / M-310 Series — 3.7V Li-ion Replacement Battery

This 3.7V, 950mAh Li-ion battery replaces the internal pack in COMfortel M-200, M-210, and M-310 cordless DECT handsets. It restores power to handsets where the original cell has aged past usable capacity. Dimensions are 51.54 × 32.75 × 8.30mm — measure your existing pack before ordering if unsure.

• M-200 / M-210 / M-310 platform fit: These models share the same battery bay dimensions and 3.7V single-cell Li-ion power rail. The connector orientation and BMS communication protocol are consistent across the series, so one pack covers all three handsets.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a calibrated rig. The BMS held cutoff voltage correctly at both ends — no premature shutdown, no overcharge flag triggered during the test sequence.
• First-charge protocol for Li-ion DECT handsets: Seat the handset in the base immediately after fitting the new battery and leave it for a full uninterrupted charge cycle. Li-ion cells shipped at partial state of charge need one complete base-station charge before the BMS accurately tracks remaining capacity.

Talk time shorter than expected on the M-200 after a battery swap

A freshly installed Li-ion pack often shows shorter talk time for the first two to three charge cycles. This happens because the BMS ships the cell at roughly 40–60% state of charge for storage safety, and its internal capacity register hasn't been calibrated to the new cell yet. Run two full charge-discharge cycles through normal use and the BMS will re-anchor its capacity estimate. After that, rated capacity figures should be consistent.

Handset not pairing with base station after battery replacement

Removing the original battery on a DECT handset cuts all power to the radio module, which can clear the stored pairing record on some M-200 units. The base station and handset both hold pairing credentials, and a full power loss on the handset side forces a re-registration. Re-pair by pressing and holding the registration button on the base until the handset prompts for a PIN — default is typically 0000. Check the M-200 manual for the exact registration sequence if the handset doesn't prompt automatically.