[westurner]

I must have logically assumed that rate of charge and discharge include time (hours) in the unit: Wh/kg.

My understanding is that there's usually a curve over time t that represents the charging rate from empty through full.

[edit]

"C rate"

Battery_(electricity)#C_rate https://en.wikipedia.org/wiki/Battery_(electricity)#C_rate

Battery_charger#C-rates https://en.wikipedia.org/wiki/Battery_charger#C-rates

> Charge and discharge rates are often denoted as C or C-rate, which is a measure of the rate at which a battery is charged or discharged relative to its capacity. As such the C-rate is defined as the charge or discharge current divided by the battery's capacity to store an electrical charge. While rarely stated explicitly, the unit of the C-rate is [h^−1], equivalent to stating the battery's capacity to store an electrical charge in unit hour times current in the same unit as the charge or discharge current.