NEC Conference Max Plus 750074 Replacement Battery 7.2V 2000mAh

NEC Conference Max Plus — 7.2V Ni-MH Replacement Battery (750074)

This is a 7.2V, 2000mAh Ni-MH replacement battery for the NEC Conference Max Plus portable conferencing unit. It replaces OEM part number 750074 and fits directly into the Conference Max Plus battery compartment. Swap it in when the original pack no longer holds a charge or fails to power the unit through a full meeting session.

• Conference Max Plus fit: The Conference Max Plus runs a 7.2V Ni-MH battery rail with a specific connector and physical envelope. This pack matches that voltage rail, connector orientation, and the 100.85 x 43.50 x 14.65mm form factor — no modification needed to seat it correctly in the housing.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the Conference Max Plus platform and confirmed the BMS accepted the cell chemistry without triggering a fault state. Voltage under combined audio and wireless draw held stable across a sustained session load.
• First-session calibration tip: After installing, run a full charge cycle before using the unit in a meeting. Conferencing systems map battery state during normal operation, and the indicator may report an inaccurate level for the first session after a swap — one full cycle corrects this.

Why the Conference Max Plus battery indicator stays wrong after a swap

The Conference Max Plus uses a voltage-threshold method to estimate remaining capacity. When a new pack goes in, the unit has no charge history for those cells, so the threshold mapping starts from zero. The indicator can show full, empty, or a static mid-level until the system observes a complete charge-to-discharge cycle. One full charge followed by normal use resets the mapping and brings the display in line with actual cell state.

Wireless connection dropping mid-meeting after battery replacement

If the Conference Max Plus loses its wireless link partway through a session, voltage sag under combined audio processing and wireless transmitter draw is usually the cause. Ni-MH cells that have not yet been conditioned show a sharper voltage dip under this dual load than a fully cycled pack. The unit's RF module is sensitive to voltage floor — if the pack dips below its operating threshold, the wireless link drops before the unit fully powers off. Charge the pack to 100% before the session and run one full cycle to condition the cells.