Sagem D10T Cordless Phone Replacement Battery 3.6V 320mAh

Sagem D10T — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 320mAh Ni-MH replacement battery for the Sagem D10T cordless DECT handset. It slots directly into the handset battery compartment and restores power to the unit. If your D10T is dying mid-call or not holding charge between docking cycles, this is the correct cell pack for that handset.

• D10T handset fit: The D10T runs a single 3.6V Ni-MH pack in a compact form factor — 30 x 32 x 10.5mm. This cell matches that voltage rail and physical envelope. The BMS on the base station expects a Ni-MH charge profile, which this chemistry satisfies without modification.
• Bench tested on actual hardware: We cycled this pack through three full charge and discharge sequences on a Ni-MH-compatible test rig. The cell accepted the trickle charge transition correctly and held voltage within spec across all three cycles. Capacity stabilised from cycle two onward.
• First charge on DECT Ni-MH packs: Place the handset in the base for a full 16 hours before first use. Ni-MH cells shipped in storage state need a slow initial charge to reach rated capacity — a quick top-up cycle will not condition the cell and talk time will appear shorter than expected for the first few uses.

Range dropping after fitting a new battery in the D10T

DECT transmit power pulls harder from the battery during RF bursts than during standby. A Ni-MH cell that has not been through conditioning cycles will show a steeper voltage sag under that load. The base station interprets the sag as a low-battery condition and the handset scales back transmit power to compensate. Running two or three full charge cycles through the base restores the cell's internal resistance to rated levels and the range issue typically clears.

Base station charge light not activating after battery swap

Ni-MH packs in storage can sit below the minimum voltage the D10T base accepts before it begins the charge cycle — usually below 3.0V. The base detects the pack but refuses to start charging because the voltage reading falls outside its expected window. To recover, leave the handset seated in the base without disturbing it for 30 to 60 minutes — most base stations will initiate a recovery trickle at around 3.0V and the charge light activates once the pack crosses that threshold.