i spent like 54 bucks on a portable jump starter and it's honestly one of the best things i've purchased in a while

two reasons: first, you never really know when you'll need to jump your car. second, even if you know you need a jump, if you're like me and get anxious talking to strangers, etc. then being able to jump your car by yourself is really really rad

if you drive, and can spare the cash, strong recommend on getting one