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My Blu Studio Mega phone will shut off whenever I use it if it’s not charging. If I open any apps to use or turn on my data it will shut off and I’ll have to wait around 5-10 minutes until I can turn it on again. The battery can’t be removed and I don’t know what to do.

@coronaharuka this is definitely sounds like a failed battery. I assume that this is a BLU Studio Mega since you did not state the maker. Batteries are readily available for this model. To remove the battery on this you most likely will have to pop off the back cover. Check this guide even so its a different model, it may still give you an idea. Blu Studio HD 6.0 Battery Replacement