Samsung second battery for Galaxy S4 with dedicated charger hits US for $50
Best Buy: Samsung Spare Battery Charging System for Select Samsung Galaxy S II Mobile Phones 37705BCW
Samsung Samsung Galaxy S4 Spare Battery Charging System - White Original OEM EB-K600BUWESTA EB-K600BUW - Other Chargers - White : Amazon.in: Electronics
Samsung Galaxy S4 GT-I9500 Charging Port Flex|USB Port Ribbon - ETrade Supply