Hey long time member short time poster, use to own a magna, I own a 1978 Chrysler lancer with a 4g54 2.6 with magna injection on it at the moment. Looking to get a run around to save driving my toy around

I'm onto a 2005 Mitsubishi 380 sx just a standard version its had vrx seats put in it, 175k kms, resprayed 2 years ago, nice rims etc my questions to all are what should I be looking for in one of these? And he mentioned he replaced the battery and after he installed the new battery the airbag light came on, is this normal? I was thinking It had something to do with the vrx seats but he said it was only after he put in the new battery which he done recently just to sell as he's upgraded any help much appreciated