by 
The Curious Bag
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Cell phone battery leakage can be attributed to several causes, including exposure to extreme weather and overcharging.
Overcharging
A battery can leak as a result of overheating if the phone is overcharged.
Cheap Batteries
Overcharging-related leakage is a common problem when a cheap or counterfeit battery is used to replace the phone's original battery. Cheaper batteries cannot sense when a battery is overcharging because they have no built-in safety detector.
Replacement
You should only purchase a replacement battery directly from the original equipment manufacturer; the battery should be designed for the same cell phone model. Exchanging batteries or even battery chargers is not recommended.
Leakage Guarantee
To replace a battery, you should contact the battery manufacturer; most batteries come with a guarantee against leakage, so the manufacturer will usually clean the phone and replace any damaged items.
Do-It-Yourself
You should wear gloves and goggles if you are replacing the battery yourself, and once the battery is removed you should clean out the leakage using a pencil eraser, an emery cloth or a vinegar/water solution applied to a cotton swab. The phone must be dry before closing it.
Source:
Ezine: Cell Phone Battery Life
Buzzle: Cheap Cell Phone Batteries
Squidoo: All About Cell Phone Batteries
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