About this replacement
Canon PowerShot G5 X Series — 3.7V Li-ion Replacement Battery (NB-13L)
This is a 3.7V, 1050mAh Li-ion replacement cell for the NB-13L battery slot. It fits the Canon PowerShot G5 X, G5 X Mark II, G1 X Mark III, and over 20 additional PowerShot bodies that share the same NB-13L footprint. Voltage and capacity match OEM spec exactly.
- G5 X and G1 X Mark III shared platform: These models use the same NB-13L voltage rail, connector pin layout, and BMS handshake protocol. One cell covers the full group — no hardware differences between them at the battery interface.
- Bench tested on actual hardware: We ran this cell through the G5 X body and OEM charger. The BMS accepted the cell, charge termination triggered correctly at 4.2V, and the battery-remaining indicator mapped without faults across the full discharge cycle.
- First-use charge cycle on NB-13L bodies: Charge this cell fully inside the camera body or OEM charger before your first shoot. Canon's BMS on these compact bodies calibrates the battery-remaining display during the first in-body charge cycle — skipping this step causes the indicator to read inaccurately from the start.
Flash capacitor recharge and current sag at low cell voltage
The built-in flash on the G5 X draws a sharp recharge current spike after each shot. When cell voltage drops toward 3.5V late in the discharge cycle, that spike pulls more current than the BMS comfortably delivers. The result is slower flash recycle time and, in some cases, a low-battery warning triggered by the voltage dip rather than actual depletion. Keeping the cell above 3.6V during flash-heavy sessions avoids this. If recycle lag appears, swap the cell before the indicator hits the final bar.
Battery percentage jumping erratically on the G5 X display
This happens when the camera's voltage-threshold table doesn't yet map accurately to the new cell's discharge curve. The OEM indicator was calibrated against the original NB-13L's specific internal resistance profile. A new cell — especially one not yet cycled — can read 60%, drop to 30%, then recover to 50% within minutes. Run one full charge-to-discharge cycle in the camera body and the indicator stabilises. After that cycle, percentage steps should track smoothly down to the 3.0V cutoff.