Canon LP-E4N EOS-1D MarkIII Replacement Battery 11.1V 2600mAh

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

This is an 11.1V, 2600mAh 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 580EX-II Speedlite, among other compatible bodies. Capacity figure is sourced from the product specification — 28.86Wh.

• EOS-1D and 1Ds series compatibility: These bodies share the same LP-E4N battery bay, voltage rail, and BMS handshake protocol. One cell works across the Mark III and Mark IV variants without modification to contacts or firmware.
• Bench tested on actual hardware: We cycled this cell through Canon's LC-E4N charger and through in-body charging on an EOS-1D Mark IV body. The BMS accepted the cell on the first charge pass and reported accurate state-of-charge through the display.
• First-cycle camera body charge: On first install, run a full charge cycle from inside the camera body or via the OEM LC-E4N charger before a shoot. Some EOS-1D bodies require one complete charge cycle to calibrate the battery-remaining display to a new cell's discharge curve.

Flash recycling drag on the EOS-1D with LP-E4N replacement cells

The 580EX-II draws a sharp capacitor-recharge current burst after each flash pop. A cell with even moderate internal resistance will show voltage sag during that recharge window. On an EOS-1D body running continuous burst with flash, this shows up as longer recycle gaps toward the end of a charge. A fresh LP-E4N replacement at full charge keeps internal resistance low, so recharge current flows without the sag. If recycling slows progressively across a single charge, the cell's internal resistance has likely climbed — check voltage at rest; a healthy cell at half charge should sit above 10.8V.

Battery percentage jumping erratically on the EOS-1D display

The EOS-1D Mark III and Mark IV map battery percentage to fixed voltage thresholds calibrated against Canon's original cell discharge curve. A replacement cell with a slightly different discharge profile hits those thresholds at different points, so the indicator can jump — for example, dropping from 60% to 20% without an obvious draw event. This is a display calibration issue, not a capacity fault. Run two full charge-discharge cycles through the camera body to let the BMS build a voltage-to-capacity map against the new cell. After two cycles, the percentage display typically stabilises.