battery's?
Yes, but it is not as safe as a sealed battery.
If your car battery smells like "rotten eggs" then your battery is producing excessive hydrogen and is probably not safe. Please check you cars' charging system and make certain that the battery is not being overcharged. The battery can possibly explode.
A car battery's function is to store electrical energy for your vehicle. When you start the car the stored energy in the battery turns your car over and once your car starts the alternater will power everything and recharge the battery.
In the battery pack
With the battery(s) and capacitors.
With a hydrometer which you can buy at any auto parts store.
You can tell a car's battery type by contacting a store that sells car batteries. You will need to give them the make and model of the car. They will let you know.
When the battery does not start your car as it normally has, or the battery runs down overnight. If you suspect it is bad then have it checked at an auto parts store.
A Car Battery. In every store that sells batteries there is a book that lists the specific battery for the vehicle. Have a store worker help you.
Dead cell in the battery or something is on pulling power from the battery. Have the battery tested at any auto parts store.
There are a number of places where one can purchase a battery charger for their solar car. Any good battery store will sell them. You can also purchase them online from sites such as eBay, Car Battery Chargers Central and Battery Stuff.