AGA : The World’s Most Powerful Compact Car Jump Starter

AGA : The World’s Most Powerful Compact Car Jump Starter
Portable, powerful, & truly versatile. AGA can jumpstart vehicles & also double as a wireless power bank!

There are a number of reasons why batteries can weaken and fail. A few common ones include:

Leaving headlights, interior lights, flashers, and the CD / radio on when the car isn't running.
Using the air conditioner when the car is not running.
Not starting a car for long periods of time (e.g., while it's in storage).
Lack of battery maintenance (e.g., not keeping terminals clean).
Failure of the diode bridge or voltage regulator in the alternator; the alternator charges the battery when the car is running.
Low air temperature, which causes batteries to freeze.