Canon LP-E4N EOS-1D Mark III Replacement Battery 11.1V 3400mAh

Canon EOS-1D Mark IV / 1Ds Mark III — 11.1V Li-ion Replacement Battery (LP-E4N)

This is a 11.1V, 3400mAh Li-ion replacement for the Canon LP-E4N battery pack. It fits the EOS-1D Mark III, EOS-1D Mark IV, EOS-1Ds Mark III, and Canon 580EX-II Speedlite among other compatible bodies. Drop the original LP-E4N alongside this cell — voltage, connector, and form factor match the OEM spec.

• EOS-1D and 1Ds series compatibility: These bodies share the same LP-E4N voltage rail and battery bay dimensions. The BMS handshake on each communicates over the same data contacts, so one cell covers the full 1D Mark III through Mark IV lineup without modification.
• Bench tested on actual hardware: We cycled this cell through a Canon LC-E4N charger and verified the BMS accepted the charge handshake without fault codes. The protection circuit responded correctly to both full-charge cutoff and low-voltage cutoff events.
• First-install charge cycle on Canon bodies: Canon 1D-series bodies use the battery data contacts to calibrate their remaining-shot display. On first install, run one full charge through the LC-E4N charger before shooting. Skipping this step can cause the body to report inaccurate remaining capacity until it completes one full charge-discharge reference cycle.

Canon BMS authentication on the EOS-1D Mark III rejecting a new third-party cell

The EOS-1D Mark III reads a data signal from the battery's communication pin on every power-on event. If the cell arrives partially discharged, the body may flag an incompatible or unrecognised battery warning before that first handshake completes cleanly. Charging the battery fully in the LC-E4N charger before first use resets the communication state the camera expects. After one complete charge cycle, the body typically accepts the cell and displays battery level normally.

Battery percentage jumping or dropping suddenly during a shoot

The EOS-1D series maps its battery-remaining display to a voltage-threshold curve calibrated for the original LP-E4N discharge profile. A new replacement cell with a slightly different discharge curve can cause the indicator to skip percentages or drop sharply, even with charge remaining. This is a calibration mismatch, not a capacity defect. Complete one full charge-discharge cycle in the camera body and the BMS will remap its thresholds — the display stabilises once the body has logged one full curve from 11.1V down to the 9.0V cutoff floor.