Bosch TR-700 Replacement Battery 7.2V 2000mAh Ni-MH

Bosch TR-700 / TR-800 — 7.2V Ni-MH Replacement Battery

This is a 7.2V, 2000mAh Ni-MH replacement battery for the Bosch TR-700 and TR-800 wireless DECT headsets. It slots into the headset housing and powers both the audio processing and the DECT radio transmission circuits. Capacity is sourced from product data at 14.4Wh — do not rely on third-party listings that inflate this figure.

• TR-700 and TR-800 compatibility: Both models share the same physical battery bay, connector pin layout, and 7.2V supply rail. The BMS handshake sequence is identical across the two, so one cell fits both without modification.
• Bench tested on actual hardware: We cycled this battery through the base station charge sequence and monitored BMS communication. The cell accepted a full charge, and the base station reported pack status correctly without a fault flag.
• First-use charging tip for DECT headsets: On first use, seat the headset in the base station and charge through one complete cycle before making a call. DECT base stations log the new cell during that first cycle — until it completes, the talk-time estimate on the display will read short or erratic.

Base station not recognising the new pack after swap

When a fresh Ni-MH cell arrives at storage voltage — typically between 6.0V and 6.4V — the TR-700 base station may show a charge error or simply not register the pack at all. The base expects to see a voltage above its detection threshold before it initiates the charge handshake. Seating the headset firmly, then leaving it undisturbed in the cradle for 10–15 minutes, usually allows the base to detect the resting voltage and begin the charge cycle. If the error persists, remove the headset, wait 30 seconds, and reseat it — this resets the base station's detection polling.

Headset cuts out mid-call even with a recently charged battery

The TR-700 draws current from two sources simultaneously during a live call: the audio amplifier circuit and the DECT radio transmitter. Under that combined load, a cell with degraded capacity — or a new cell not yet through its first full charge cycle — can sag below the BMS cutoff threshold and drop the connection. This is not a headset fault. Charge the battery fully in the base station, confirm the charge indicator shows complete, then test on a call. If cut-outs continue after three full charge-discharge cycles, the cell voltage under load is not recovering above 6.0V and the pack needs replacement.