Just keep in mind, Samsung typically fills up stock battery to max capacity which is also limited by it's physical size (number of cells it can fit in). So, any stock size battery claiming more than 2600 mAh will be bull (typical for HK retailers with fake battery labels). The same goes for double size extended capacity 5200 mAh. I wouldn't be surprised if Mugen will offer 5400 mAh, like they did that with Note 2 by squeezing a few more mAh in. Anything you see on ebay or Amazon claiming 6000 mAh or so will be a lie. Since you guys mentioned Zerolemon 3x capacity battery, I'm sure they will have one for S4 as well. Right now, we (N2 owners
) still enjoying their 9300 mAh release from a few weeks ago, and ZL guys are working on new rugged case for N2 battery. So mostly likely expect ZL triple capacity S4 battery mid/late summer; just my guess. With extended double capacity, I'm sure Mugen (although way too overpriced), Anker, and Hyperion will be trusted sources. Be cautious with ebay stuff, beside lying about extra capacity often they can't even meet OEM capacity (I tested their "Gold" battery to find it 1000 mAh less than OEM capacity, while their label claimed 1100 mAh over stock capacity lol!!!).
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