Replacing a car battery normally takes about 5 minutes unless there is a problem such as corroded wires.
Take them to anyplace that sells batteries for recycling.
There are no solar car batteries you can buy. You can purchase a solar battery charger and solar panels but not a solar battery that you install in a vehicle.
Do you mean where on a car is a block heater install or who do you take the car to to install?
how long is a piece of string
An electric car needs to be charged until the indicator on the charger says the batteries are charged. It will depend on the amperage of the batteries, the way the charging mechanism works, and the percentage of discharge of the batteries.
I know of no vehicle that is powered by double A batteries, so the question is mute.
Any place that sells batteries will take your old battery.
Take it to anyplace that sells batteries or a salvage yard.
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Car batteries are rechargeable storage batteries. They are designed to be constantly recharged.
most battery last five years
it takes a 9 volt battery