Even if your phone isn't under warranty, the manufacturer may be able to point you in the direction of a reputable battery source.
Due to the sheer number of calls your manufacturer's customer service line is likely fielding, this step may take a large chunk of time to complete.
2.Confirm that your phone has a removable battery. If your call to your phone's manufacturer proves unsuccessful, you'll need to replace the battery yourself. Specifically, you should determine whether or not you can quickly and easily remove your phone's battery; most Android phones fit this criterion, whereas iPhone users should skip ahead to the "Choosing a Charger" section.
Usually, if your phone has an easily-removable battery, you will be able to access the battery by sliding a panel off of the back of the phone.
If you have an iPhone, you can send it in to an Apple store to have the battery replaced. This process is expensive, but you run the risk of ruining your phone and/or voiding your warranty if you attempt to remove the battery yourself.
You can usually find a device's user manual online if you can't locate it.
Battery type (e.g., Lithium Ion vs. NiCAD).
Your phone's manufacturing date.
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