Originally Posted by sderman
I use a Battery Tender attaching the clips to the car battery's cables before loosening the battery cable clamps. Works perfectly, saving all settings. Just be sure to wrap each "connection" in tape to prevent inadvertently touching a ground. The 9V thing in the lighter probably won't work for cars where the lighter circuit is not powdered when the engine is off.
no i have not done it via the cigarette lighter. it was through a positive pole inside the hood of the car that is active using alligator clips. 9v was used so it wont overload the system once the 12v battery is connected. Cant seem to locate a similar post in my RX.