ok so i just took the battery out of my brothers 97 accord its a diehard with 700cca and put it in my car. cranks perfect even turned it off and cranked it again started fine. but then i took it out and put my old battery on and it wont crank just one click then i try again and its dead. forgot to mention that last week i went to best buy to get my headunit installed and he did do some wireing around. should i get a bigger battery? wthhhh