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It’s not a problem with the battery, and replacing the battery won’t fix it. There’s a leakage somewhere that’s causing the battery to drain. It will be something that’s not turning off when the car is turned off, like a computer, a light, or something that’s staying on all the time when it shouldn’t be. Try an auto electrician.
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Lexus doesn’t have a towing rating for the GS 450H and doesn’t recommend that you tow with it. They would rather see you using an RX SUV hybrid, which has a towing rating of 1600 kg, for your purpose.
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