# Battery charge-time estimate
# Scope: Constant-current bulk phase with supplied effective charge efficiency; taper omitted.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

capacity = 10 Ah
initialFraction = 0.2
targetFraction = 0.8
current = 2 A
efficiency = 0.95

duration := capacity*(targetFraction-initialFraction)/(current*efficiency) [h]

check bulk charge time budget: duration <= 4 h

scenario alternative: capacity = 8 Ah