i got to work on the GPS that needs 5V, i just bought a universal adapter, set it to 5V and connected the positve to VIN (GPS) negative to GND(GPS) to the adapter. before that, im powering the core to a 220V outlet, i just plugged the VIN to the 5V and the GND to the core and still no fix. just this morning i did the impossible.
now i think the only way to power up the core and the GPS is to ask you guys that what is the maximum capacity of the battery shield to power up 5V and the 44mAH power consumption of the GPS and also specially the core. thanks!