2006 Lexus RX 400h - Battery issues when parked

if I park the suv for a weak the battery is drained never recharge have to buy new want to know what is the problem

It’s possible you have what’s called a “parasitic draw,” where there’s a constant drain on the battery. It’s also possible the battery is weak and near the end of its life. All newer cars use a certain amount of current even when the engine is off and that might be enough if the battery is marginal. There are a couple of things you can try that don’t involve going to a mechanic. First, try a “trickle charger” that will maintain the battery. There are even solar powered ones. Second, just get in the car and drive it occasionally so the battery doesn’t have a chance to get too far drained.

Here is a link that can help you out with that kind of problem.

Which battery? The 12V battery or the hybrid battery?