V Tech BT283642 Cordless Phone Wireless Mic Compatible Battery 2.4V 300mAh

V Tech VCS702 Wireless Mic — 2.4V Ni-MH Replacement Battery (BT283642)

This 2.4V, 300mAh Ni-MH cell replaces the OEM BT283642 and BT183642 packs in the V Tech VCS702 Wireless Mic and LS1350B. It restores charging capacity when the original pack can no longer hold a useful charge. The cell matches the original voltage, chemistry, and connector so the base station recognises it without modification.

• VCS702 and LS1350B compatibility: Both devices share the same 2.4V two-cell NiMH architecture, the same BT283642 connector pinout, and the same base-station charge circuit. One cell fits both without any adapter or wiring change.
• Bench tested on actual hardware: We cycled this cell through the VCS702 base charge circuit. The BMS accepted the pack without a charge-error light, and the cell reached rated voltage within the standard charge window.
• First-charge protocol for NiMH cordless mic packs: After installing, seat the VCS702 handset in the base for a full 16 hours before first use. NiMH cells shipped from storage are partially discharged — a slow first charge is required to reach the 300mAh rated capacity.

Base station showing a charging error after fitting a new NiMH pack

V Tech base stations check incoming cell voltage before committing to a charge cycle. A NiMH pack that has sat in storage can drop below the base's acceptance threshold — typically under 2.0V — triggering a fault light instead of a charge indicator. The fix is to place the handset in the base and leave it undisturbed for at least 30 minutes. Most base stations will recover the cell with a trickle charge and then switch to full charge once voltage climbs above 2.1V.

Talk time shorter than expected after the first few uses

NiMH cells do not deliver rated capacity on the first one or two cycles — this is normal, not a fault. Capacity builds over three to five full charge-and-use cycles as the cell chemistry stabilises. Force a full discharge by using the mic until the handset signals low battery, then do a complete 16-hour base charge. By cycle five, the cell should be delivering close to its rated 300mAh.