I saw some DIY projects about boosting car lead acid batteries. A supercapacitor bank is connected in parallel with a lead acid battery to stabilize the supply.
However, in the market, I can only find 16 Volt capacitor banks. And my lead acid battery is 12 volts. (fully charged voltage is about 13volts)
I'm pretty sure the starter motor is not going to like that extra voltage. Regardless, What will happen when a fully charged 16-Volt supercapacitor bank and a fully charged 12V lead acid battery are in parallel when the engine is stopped?