Regarding the bulging battery issues. This is an article from phonearena.com
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Samsung might have an issue on its hands with the battery on the Galaxy S4, at least in European batches, which it apparently acknowledged, and is offering free replacements for those affected.
The story began when many owners of the Galaxy S4 started bringing theirs to the carrier they acquired them from, complaining from overheating, endurance degradation, and even straight-out swelling of the unit. Half a year since introduction, the issue seemingly reached endemic proportions, with carrier insiders reporting up to 30% of their Galaxy S4 customers coming with such complaints, so not isolated incidents.
Samsung has, apparently, issued a statement for Trusted Reviews you can see below that they are aware of the issue, and everyone affected will be compensated with a free replacement. Has any of you experienced something similar with their Galaxy S4 unit?
"We are aware of this issue, which has affected a limited number of customers. We ask all affected customers to please visit their nearest Samsung Electronics service centre, where they can receive a replacement battery for free of charge. We remain committed to providing the best possible user experience for our customers".
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My nearest Samsung Service Centre is at Carphone Warehouse, which is about 5 miles away. I'll be popping in there next week to get a replacement.