Battery dead how do i open if lost key?

Normally the key will open the door by inserting it into the key hole in the door or boot if the car battery is flat. If the battery is flat in your remote, then you need to purchase a new mini battery which you can purchase from **** Smith or Jaycar. A mini Philips head screwdriver will open the back of the key unit to reveal the mini battery or most likely, a friendly staff person at the shop will help. Denis.