I've been fighting a slow drain on my 2015 LS460 for months, taking it to three different shops that all said "battery is fine" but the car would still struggle to start after sitting for two days. A friend who works at a dealer suggested I stop messing around and call lexus battery replacement specialists, so I gave it a shot even though I was skeptical about mobile services. The guy showed up with a proper diagnostic tool, found a faulty door module that was pulling current, then installed the correct AGM battery and coded it to the car on the spot. It's been over a month now and no more slow cranks or warning lights. I wish I'd done this sooner instead of wasting time and money on places that just wanted to sell me a cheap battery and call it done.