Is the motherboard on my IPhone 6 fried?

So I have an IPhone 6 and I recently had let it die because I wasn't going to use it for awhile. It must've gone completely flat because afterwards it wouldn't even show the dead battery screen. About 3 days after I put it to charge and it just went into the apple logo loop and won't hold any charge as when I unplug it it shuts off. Is the motherboard on my phone fried or is it a software issue?

It may be the battery.

Purely software.
It's common thing that happens to phones and tablets if the battery dies completely.

Leave it on charge for a few hours then press the home + power buttons for ten seconds, until it goes back to the apple logo.

Still leave it on charge, whether it appears to work or no and check it / try again in a couple of hours.

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