Does anyone know if portable battery chargers or car 'super fast' charges damage iphone 4 battery?

How do I know if I should use these devices without 'damaging' iphone's battery? I heard from a friend that battery finished much faster after she used  ' Best Portable Charger from Marware' and also a faster charger in the car, PowerBolt Duo from Kensington. Thanks for any information; I wanted to knw what I would have to look into in case I would like to try one of these or both.

if the charger don't provide more then the 5volts it can never ever ever ever damage the ios device

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