Date registered: Dec 2002
Vehicle: 92 500SEL to 01 E320T current 2014 lexus LS460
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I assume you have the "older" style smart key, otherwise someone else will have to help.
You need to pull the emergency key out of the housing, by releasing the latch at the top. Then look into the opening for a gray bar, slide over while pulling on the resr of the housing, which will slide out like a drawer, the batteries are stacked, reverse the proceedure.