I got stuck twice in the last month and Lexus dealer in Freehold Nj can't find anything wrong.ROADSIDE ASSISTANCE COMES OUT AND JUMPS ME AND IM ON MY WAY.IS THERE AN ELECTRICAL DRAIN THAT LEXUS CANT FIND????

 

Probably. How often do you drive it and how far each time? My father's ES350 has this same issue off and on. He went through 3 batteries in 4 years. Finally got a battery maintainer to keep it topped up.

 

I would take the offending battery to a auto parts store like Autozone and have them load test your battery to determine if the problem is because of a bad cell(s) in your battery that prevents it from holding a charge.

I would also charge or use a battery maintainer for now on for your new battery or present battery to keep it properly charged every month.

I personally charge my car batteries at the beginning of every month with a Sears battery charger, and it helps my batteries last longer.

Just my advice.

 

AAA roadside assistance will do a free power check on your battery/charging system to see where the fault lies. You don't say how old your battery is, but if it's four years old, you probably have a dead cell which will give intermittent performance. In other words, the battery will work for a week or so, then come up dead for no apparent reason, then when you take it in, it behaves itself and passes a test. You can check each cell yourself with a hydrometer (cheap) if it's the wet-cell type. Good luck. I think you need a new battery, but that's just my opinion. Please let us know what transpires.
Ray A.

 

A cheap backup could be a jump starter battery you keep in your trunk. I have a JumpNCarry for about $60 in each car, top off the charge quarterly. Seoul to quickly jump you car or a friend's car.