admin OK. I see what you mean, I completely misread/understood it, in which case I would suggest that you change the description to:
You can set a target percentage for the battery to charge to by the end of the charge window.
Or you could have a three radio button or slider selection against Smart charging:
Smart Charge / Fixed Charge / Maximum Charge
and in the descriptor lines add
Maximum: Charge/Discharge to the target percentage at the inverter specified 'Charge/Discharge Power'.