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Thank you so much for the valuable informations, actually the powerbank voltage is 5V, my bad.As for the powerbank, Im planning to charge it using the normal way. The idea here is that Im using a Powerbank that turns on once it is connected and off when disconnected. Im planning on using an android application to turn on the flash light once the phone is on 15% so that the LDR detects it and the PIC command the relay to switch. So once the powerbank gets connected it should turn on and start charging the phone. what do you think ? can I use a MOSFET instead of a relay ? as much as I know, relays are all-or-nothing (like switches) whereas a MOSFET can transmit more or less current I guess, which the powerbank will detect I guess and then it will turn on ..