Power vs energy
Two strengths. One range.
Every cell is a trade-off between how fast it can deliver energy and how much it can hold. Power cells sit high on the chart — built for rapid discharge. Energy cells sit right — built for capacity. Where a cell lands tells you instantly what it's designed to do, and the bubble size shows the total energy each one carries.
Power vs. Energy
Capacity against continuous discharge rate — bubble size shows energy per cell (Wh)
18650 Power Cell
26650 Power Cell
18650 Energy Cell
32140 Energy Cell
bubble size = energy (Wh)
Energy Density
More energy, less space
Measured in watt-hours per kilogram (Wh/kg) and watt-hours per litre (Wh/L), energy density tells you how much power a cell stores relative to its weight and size. Higher values mean more energy in the same footprint, critical for applications where space and weight are constrained.
Energy densityWh/kgWh/L
18650 Power Cell
26650 Power Cell
18650 Energy Cell
32140 Energy Cell
0100200300400450
Discharge capability
How hard can it work?
C-rate measures how quickly a cell can deliver its stored energy. A higher C-rate means faster power delivery, essential for applications that demand short, intense bursts or sustained high-current output. Continuous discharge is the sustained working rate; 10-second pulse is the peak the cell can handle in short bursts.
Discharge capability (C-rate)Continuous10s pulse
18650 Power Cell
26650 Power Cell
18650 Energy Cell
32140 Energy Cell
0C10C20C30C40C50C
Operating temperature
Built for real-world conditions
Not all applications run at room temperature. The operating temperature range defines where each cell can safely discharge, charge, and be stored. A wider range means greater flexibility across demanding environments, from cold-start industrial sites to high-temperature industrial equipment.
Operating temperature (°C)DischargeCharge
18650 Power Cell
26650 Power Cell
18650 Energy Cell
32140 Energy Cell
−40°−20°0°20°40°60°70°