If your battery is not charged, you will not be able to use your electronic key to get in the car. The latch to the hood is also inside the vehicle so you cannot get a jump start from a helpful motorist. If something important is inside the car, like your beloved pet, this makes for an urgent situation. You may end up breaking the window to rescue your dog or cat. Again, if you use your spare keys stuck up underneath the car with a strong magnet ahead of time, you will have an easy solution to the situation.
After you get the door open, you can use the latch to open your hood and accept help from another driver. This is quite easy as long as they have jumper cables. Open your hood up and ask someone if they can help you. Another device comes in handy if there is no one around. Solar battery chargers are available for very little expense. Strong Magnets.
You can charge up the battery through the cigarette lighter in your car using the solar cell in the battery charger to do so. If your car is facing the sun, the cell can be put up on your dash to draw up the sunlight. If not, it can be put in the back window so that the battery is able to start the car. When the car does start, the solar cell can be unplugged and put back where it was before. Your car is now ready to drive.
If you purchase and keep a few accessories in your auto, your life will be so much simpler if any of these situations arise. Without them, it can be very frustrating and dangerous. You could have far more damage resulting to your car than what it costs you to buy these things to help with a dead automotive battery.