Ok, so basicly i got this circuit from LED keychain that houses 2 3mm leds, resistor, on off switch, and it obtains power from 1 cd2025 flat battery. what id like to do is modify this curcuit board to operate from 4x aa or aaa battery box i stole from my sons broken down toy and upgrade the circuit to power up 8x LED 5mm. I got wires, soldering iron and soldering, shrinking tubes and all, but do i need some other parts or can i just weld out thebatterybox, cut the wires of leds and extend it those with wires to 2x4 set of LEDs. leds are paralel and in serie. what else i need to know if i do this? plan was to use it as a circuit inside my airsoft mask, that would hold the switch on the side, that also houses the circuit board, and inside is the battery box.