I have a Kyocera Echo external battery charger, can I use it with my S4? The battery says that it can only be used with Kyocera phones, but I don'the believe that.
You can use it WITH ANY phone, as long as it uses a standard micro-usb connector, but it might charge slow if it's 0.5A or 1A charger, while I think S4 can charger at faster 2A speed.
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