Schneider SST100 Cordless Phone Compatible Battery 3.6V 700mAh

Schneider SST100 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 700mAh Ni-MH rechargeable battery for the Schneider SST100 cordless phone handset. It replaces the original pack when talk time has shortened or the handset needs charging far more often than it used to. Voltage and cell chemistry match the SST100 base station's charge circuit exactly.

• SST100 handset fit: The SST100 uses a 3.6V three-cell Ni-MH pack with a specific footprint — 50.79 x 42.40 x 14.23mm. That dimensional match is what keeps the contacts seated and the battery door closed. A physically loose pack causes intermittent charging even when voltage is correct.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the bench to confirm the BMS in the SST100 base accepts the cell voltage at rest and at charge termination. The base station's delta-V detection triggered cleanly at full charge with no false cutoff.
• First-charge protocol for Ni-MH handsets: Place the handset in the base for a full 16 hours before the first use. Ni-MH cells arrive partially discharged from storage. Skipping this step locks the pack into a lower usable capacity that a short first charge cannot recover.

Base station charge light not coming on after fitting a new Ni-MH pack

The SST100 base uses delta-V detection to sense a charging Ni-MH cell — it looks for a small voltage rise as current flows in. A new pack that has self-discharged in storage can sit below the voltage threshold the base uses to start that detection loop. The base interprets the low resting voltage as a fault rather than an empty cell. Placing the handset in the base cradle for 30 minutes, removing it, and reseating it often re-initiates the charge handshake once the base has pushed enough current to lift the pack above 3.2V.

Range drops noticeably within the first few minutes of a call

DECT transmit power on the SST100 handset is tied directly to the voltage the battery can hold under RF load. When a Ni-MH pack is new or freshly conditioned, its internal resistance is higher and voltage sags more sharply the moment the radio module draws current. That sag reduces transmit power, which the handset registers as a weaker signal to the base. After three to five full charge-discharge cycles, internal resistance drops and the voltage holds steadier — range returns to normal without any settings change.