Does anyone know why a Coolpad Legacy will not charge on a portable charger or off a vehicle charger?

 I just bought a new Coolpad Legacy, and it's an amazing phone for for the most part that I can tell, but it doesn't seem to want to charge off of a car charger or portable charger? It will say the phone is charging, but it takes like 2 hours to go up 5%! What is the reason for this? Does it need a special type of portable charger?

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