You undo the battery to clear most chipped cars if you dont wanna vag-com it, but you need to go thru a list of things to reboot the ECU if GIAC has a security feature. I'd check w/ your chip installer and see what they think. If you undo the battery, remember to let the TB align sensor relearn for 30 secs once power is returned to the car and the key is turned (Stay off the throttle on fire up) and then you must roll windows all the way down, then all the way up to let your one touch relearn thier limits. Depending on the chip functions more headaches may occur.
Being a GIAC customer I am sure you are familiar w/ headaches, and heartbreaks.... (Thats for you Paul) :P