Insta360 One X Replacement Battery 3.8V 1100mAh

Insta360 One X — 3.8V Li-ion Replacement Battery (PL903135VT)

This is a 3.8V, 1100mAh Li-ion cell replacement for the Insta360 One X 360-degree action camera. It fits directly into the One X body and matches the OEM cell dimensions at 38.23 × 31.80 × 9.85mm. Voltage and capacity figures match the original PL903135VT specification.

• One X platform fit: The One X uses a single cell with a fixed 3.8V nominal rail and a specific contact layout on the battery door. This cell replicates that contact spacing and BMS communication path so the camera body accepts it without a firmware conflict.
• Bench tested on actual hardware: We ran this cell in an Insta360 One X body and confirmed the BMS handshake completed on first install. Charge acceptance, temperature monitoring, and discharge cutoff all triggered at expected thresholds during a full cycle.
• First-cycle conditioning on the One X: Run one complete charge cycle through the camera body or the OEM USB-C charger before heavy shooting. The One X BMS maps its battery-remaining display to a discharge curve it calibrates on first use — skipping this step causes the indicator to read inaccurately from the start.

Why the One X battery percentage jumps erratically after installing a new cell

The One X battery indicator is mapped to a voltage-threshold table calibrated against the original cell's discharge curve. A new cell, even at the correct capacity, discharges through those voltage steps at a slightly different rate until the BMS has logged a full cycle. This causes the display to skip or jump — often dropping sharply from 80% to 30% mid-use. One full charge-to-discharge cycle corrects the calibration and stabilises the readout.

One X shows dead battery icon on a replacement cell that still has charge

This happens when the cell voltage has dropped below the camera's low-battery cutoff threshold — typically around 3.2V — but the cell itself has not fully discharged. It can also occur if the replacement cell shipped at a low storage charge. Connect the battery to the OEM charger via USB-C and let it charge uninterrupted until the indicator shows full. If the camera still shows a dead battery icon after a complete charge cycle, check the contacts on the battery door for debris or a bent pin — a poor contact causes the camera to read an artificially low voltage at the input rail.