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Help Fast charging not so fast anymore.

never use another charger
the charger may hamper with the battery as there are so many types of batteries now.

Using another charger is fine as long as you have the same amperage or higher. I purchased a car charger that was 2 amps and it charges the battery just as well as my wall charger. No difference in battery. Voltage should be the around the same.
 
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