will disconected batt alter other elect components in vehicle?

If it's done properly you won't damage anything. you will lose your radio memory (station pre-sets)and clock will have to be reset. MAIN item is to have your radios anti-theft code available.a five digit number you need to enter when you power up the radio after re-connecting the battery.can be on a small white sticker in/around edges of glove box , also supposed to be in "service history" book first page by vin info .