For around $100 (USD) you can buy a battery pack that is able to jump your car. A quick google search for "jump starter battery pack" will show many options and price ranges. They'll often be able to inflate tires, charge phones and other handy utilities too. read more
How to Charge a Car Battery Four Methods: Preparing to Charge the Battery Using a Speed or Trickle Charger Jump Starting Your Battery Troubleshooting Battery Issues Community Q&A Car batteries stay charged by harnessing the extra power of the car's engine, and most can go for at least five years without needing to be replaced or recharged. read more
You need to put the charge back in using one of two methods virtually anyone can successfully complete – using a car battery charger or jumpstarting your battery from another running vehicle. For traditional car batteries (not electric car varieties), the process is essentially the same regardless of your battery type or choice of charger. read more