This is a test of commonsense. Complete the next sentence:

How to fix a cell phone
Check the batteries.
Batteries are one of the first parts that fail on phones. It's also one of the parts that are very easy to fix.
When your phone quickly runs out of battery or it feels bloated, it's time to go to the nearest electronic store and purchase a new battery pack. When purchasing a new battery for your phone, remember to pick the one that's specifically for your phone only.