Hi!
I am planing to make a MCU based battery charger and want to find out about followings,

1, What are the constant voltage type batteries.
2, How we can sense that battery is fully charged in constant current and in constant voltage type battery.
3, What type of batteries are car batteries. Const. I or Const. V.
4, How can we calculate sufficient current required in constant current batteries. some one suggested the 10% of the max. current rated on the battery will be enough.

Thankyou!