# Coloumbic Efficiency

$\eta_{c} = \frac{Q_{out}}{Q_{in}}\,$
Where $\eta_{c} \,$ is the coloumbic efficiency (pu)
$Q_{out} \,$ is the amount of charge that exits the battery during the discharge cycle (C)
$Q_{in} \,$ is the amount of charge that enters the battery during the charging cycle (C)