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A new phone holds its power for a whole day. Two years later, the same phone is empty by six. The is not broken. It is simply older, and every battery gets weaker with time.
Inside the battery, a moves from one side to the other. Each time you the phone, the battery loses a little of it. After about five hundred charges, the change is easy to feel. Heat makes it faster.
So do not leave your phone in the sun or on a hot . A car in August is the worst place of all. Try to charge the phone before it is empty. Short charges are better than one long one.
A shop can put in a new battery for less than a phone costs. Ask for the price first, because some are harder to open. A phone with a battery can last two more years.