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I had this issue with my Lexus a few years ago. Turned out the cars electronics were fine, but I had an aftermarket HID foglight kit which was draining power from the battery even when the car and lights were off. Lexus diagnosed the car was draining electricity when switched off. I disconnected the accessories one by one - radar, laser jammer, GPS tracker, fog lights to identify issue. fortunately the fog lights were my second guess after the GPS tracker so it didn't take long.
Also whenever the battery gets fully drained it damages the battery. If its happened 2-3 times you may need a new battery. I was lucky that Lexus gave me three free batteries in a row because they didn't know it was caused by my accessory.
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