Your battery will drain if it is not charged. Fortunately, your battery can be charged in just a few simple tips. You should make sure that the battery terminals are clean before you charge them. Check the owner's manual in order to see the recommended voltage. The owner's manual will also give you the specific charger instructions. Disconnect the battery terminals and connect the charger cables. There is an ammeter that will tell you whether the battery is charging.
Keep in mind that using a charger is not the only way that you can charge your battery. If your battery goes dead, then you can use jumper cables. You can connect the battery to another car and rev the engine. This is a quick process, but it is not practical for charging an old or weak battery. A charger is your best option.