In order to avoid power related issues with any of the Raspberry Pi 3 model, it is recommended to just directly power it from your power supply (PowerBoost 1000c, GearBest PowerBoost, etc.).
So here’s how you would power your Pi 3 which is the same for all the models (Model B, Model B+, Model A+). The
PP2 pad goes to the 5V+ output of your Power Supply and the
PP5 pad goes to the GND output of your Power Supply. Use a wire that’s 24-26awg in size.