You can expect it to be at ~60% of charge, maybe less. Level of charge may indicate how long it was in storage, as "from factory" it have around 80% of charge.

Yes, it is scam, and discussed just few posts ago, on the same page Fancy package shouldn't be considered a sign of fake battery (once, "best" scuds have some most extreme over-packaging for a batteries - a box for single battery, that could hold 10 cells or more...), but capacity *is* such a sign.

Again, using current technology, you can't expect a battery of this size to hold more than 1600 mAh. When new technology will arrive, you won't have chance to "buy" it by accident - price will be 20x or 30x higher, at the beginning.

Charger should work OK, but don't expect it to charge battery quickly. Those things are damn slow (low current). Some tends to heat a lot, too (due to poor implementation of" constant voltage" charging scheme), but the latter improved in "cheap external chargers" market, lately.

As for repairing uSB port, you definitely *should NOT*:

...unless you want to fry other elements, due to heat dissipation through ground plane and via tracks (if not by heat from hot air, itself). To properly repair it, you should use a needle-thin tip for regular soldering iron, a good soldering flux/paste. Apply flux or paste via (another) needle to contact pads and USB port pins, heating your soldering iron in the meantime. You need to have it *very* hot, to do quick job on pins - you don't want to heat them for prolonged time, due to mentioned heat transfer through tracks (which may, and often *will*, damage adjacent components).

re-solder every pin (magnifying glass can help, too), then, you should reinforce port to the ground itself, using normal n(not needle-like) soldering tip. Keep in mind to not overheat ground plane - you need decently heated soldering iron to job quickly, without heating ground for too long.
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Generally, everything you need to know was wirtten dozens of times in appropriate threads, like "fixing USB port, before and after it's too late").

/Estel