Compare runtime at high and low speeds
Use like-for-like manufacturer figures when comparing battery claims.
Read the setting beside the number
All three listings give about 45 minutes at high speed and 90 minutes at low speed. If you need a planning figure for high speed, use the shorter figure. See CalExotics’ specs for X-5, X-10, POWER BALLS.
Keep charge and run time separate
The two-hour figure describes charging, while the minute figures describe runtime under the stated settings. Keep those in separate columns when comparing another model. Intermediate settings and battery behavior over time are not quantified.
Match the cable by exact model
The listings describe USB charging. That tells you how the cable is powered, and does not identify a universal device-side connector. Confirm the device-side connector and exact SKU before ordering a replacement lead.