Tunstall Dect Handset 7202 Compatible Battery 3.7V 950mAh

Tunstall Dect Handset 7202 / 7212 / 7722 / 7202P — 3.7V Li-ion Replacement Battery

This is a 3.7V, 950mAh Li-ion battery for the Tunstall Dect handset range used in care and healthcare facilities. It fits the Dect handset 7202, 7212, 7722, and 7202P. Physical dimensions are 51.54 × 32.75 × 8.30mm — check these against your existing cell before ordering.

• Dect 7202 / 7212 / 7722 / 7202P compatibility: These four handsets share the same 3.7V Li-ion cell format, connector pinout, and BMS charge acceptance threshold, which is why one battery covers the full group.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Tunstall base station circuit. The BMS accepted charge cleanly from the base, held the protection cutoffs at expected low-voltage limits, and showed no false overcharge trips.
• First-charge protocol for Li-ion care-setting handsets: After fitting this battery, seat the handset in its base and leave it for a full uninterrupted charge before first use. Tunstall base stations use a trickle-top-up charge profile — partial or interrupted first charges can cause the BMS to report a lower usable capacity than the cell actually holds.

Why the Tunstall Dect 7202 loses range after a battery swap

DECT RF transmission draws a burst of current every 10ms during active calls. If a replacement Li-ion cell has high internal resistance — common in poorly stored stock — the terminal voltage sags under that burst load. The handset's transmit power drops to compensate, and effective range shrinks noticeably. A fresh, correctly stored cell with low internal resistance maintains a stable voltage rail under RF burst load, keeping transmit power at its rated level. If range problems persist after fitting this battery, fully cycle the handset twice — charge to full, use to low, recharge — before concluding there is a range issue.

Base station charge light stays off or shows error on a new battery

Li-ion cells that have self-discharged during storage can drop below the base station's charge-acceptance voltage threshold — typically around 3.0V for this chemistry. When the base sees a voltage below that threshold, it withholds charge as a protection measure and may show no activity or an error indicator. Remove the handset, wait 30 seconds, and reseat it firmly — this resets the base's charge controller and often triggers a fresh acceptance check. If the base still does not charge, use a bench charger or a compatible USB Li-ion charging board to pre-charge the cell above 3.2V, then return it to the Tunstall base to complete the charge normally.