The new GoPro Hero4 Session is an impressive waterproof camera capable of capturing4K Ultra HD video at up to 240 frames per second without the need for a waterproof case. It’s also quite expensive, retailing for $400. But is the palm-sized action-cam really worth that much cash, what with its distinct lack of replaceable parts? iFixit recentlydisassembled one to find out.

The team quickly discovered that any sort of repair beyond the outer glass lens (for which GoPRo does sell replacement kits) is basically impossible thanks to the manufacturer’s waterproofing efforts. That’s a pain. The Session’s battery, which is pretty small at 1000 mAh is likely going to need to be recharged more often than the Hero 3’s power cell, thereby degrading faster and requiring replacement sooner. Except you can’t replace it due to the waterproofed case.
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https://www.engadget.com/2015/07/17/ifixit-hero4-session-teardown-its-impossible-to-repair/