IDX System MC-2U Replacement Battery 7.4V 1500mAh Li-ion

IDX System MC-2U / UC-PD1 / UC-PD2 — 7.4V Li-ion Replacement Battery

This 7.4V, 1500mAh Li-ion cell replaces the original battery in the IDX System MC-2U, UC-PD1, and UC-PD2 camera power units. These devices are used in professional broadcast and video production environments where power continuity matters. Capacity figures come from the product specification: 1500mAh / 11.1Wh.

• MC-2U, UC-PD1, and UC-PD2 compatibility: All three units share the same 7.4V two-cell Li-ion architecture and connector format. The BMS voltage thresholds and charge termination behaviour are consistent across this product family, which is why a single cell replacement covers all three.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench and confirmed the BMS accepted the replacement without fault flags. Charge termination triggered correctly at full capacity with no overcharge events recorded.
• First charge cycle on the UC-PD1 and UC-PD2: Run one full charge cycle through the OEM charger or the camera body before heavy production use. Some IDX BMS firmware requires this initial cycle to calibrate the battery-remaining display and map the new cell's discharge curve accurately.

Battery percentage display showing wrong values after fitting a replacement cell

The MC-2U and related units read state-of-charge by mapping voltage to a stored discharge curve. A new Li-ion cell has a slightly different resting voltage profile at each charge level compared to an aged original. Until the BMS recalibrates, the percentage shown on the unit can read high or low relative to actual charge. Running one complete discharge-to-cutoff followed by a full recharge typically resolves this. After that cycle, the indicator tracks the new cell's actual discharge curve instead of the old one.

Camera body showing no battery or incompatible battery on a valid replacement cell

This happens when the camera's authentication handshake does not receive an expected response from the cell on first insertion. The fix is straightforward: remove the battery, insert it again, then place it on charge via the OEM charger for at least 15 minutes before powering the unit on. This sequence lets the BMS initialise fully and pass the handshake at the correct voltage — typically 7.4V nominal. After that, the unit recognises the cell without further prompting.