Why won't ZTE Quartz turn on?

Ive just got this zte quartz and its only change has been updates, no new apps or drops etc. Why does it do this and it doesn't do that when plugged in? Since it has a built in battery I'm assuming not a bad connection but more hardware issues. Any suggestions are appreciated. Thanks.

Hi James. Use a working charger, try other phone to confirm it. Let it charge for at least 15 minutes. Then what others did when their phones don't turn on is press and hold volume up key + power key. Try it and let us know how it goes.

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