Chosen Solution

I replaced the battery for iPhone 5s with ifixit battery in April 2017. After 6 months, the battery died. Cannot start the iPhone. Is that normal ? (normal usage) My 5s keeps restarting until the battery is completely drained.

With batteries you never really know and it also depends on the type of usage/charging you put it through. However, I don’t think it’s normal. I would contact iFixit Support (we’re just volunteers here answering repair questions).