Manual - Samsung Galaxy S4 Active - Android 4.2.2 - Call me Guides
DAXTROMN 2600mAh Galaxy S4 Li-ion Replacement Battery with NFC Function for Samsung I337, Verizon I545, Sprint L720, T-Mobile M919, R970, I9500, I9505 ( Not for Galaxy S4 Active or S4 Mini): Amazon.co.uk: Electronics
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Samsung Galaxy S4 Active review: a top-tier phone in a water-resistant package | Engadget