Accessory Expandable memory/battery case

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http://androidforums.com – Hey All, Long time lurker, first time poster! I'm about to get my hands on a One XL, and the only down side I see so far is non expandable memory and battery performance on 4G (all 4G phones!) Is there such thing as a battery case which also has built in memory, (or. Just an external battery with extra memory)? Alternatively, what is the best and most compact external battery and/or external memory solution? Thanks in advance! Mike (General)