Battery Dies Too Quickly - ClubLexus - Lexus Forum Discussion

Hybrid Technology Unique topics related to the 2004 -2009 RX400H model hybrid drivetrain and other features/options found only on the RX400H. Please use the main forum for discussion about shared components with other second generation RX models.

Battery Dies Too Quickly

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Old 04-28-14, 12:54 PM   #1
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Default Battery Dies Too Quickly

I have an RX400h and the auxiliary battery dies after a couple days. Last time I went out of town I came back a week later to a dead battery. Went to Lexus and they replaced it. That was about 2 months ago. This weekend I went to Phoenix for 4 days and came back to a dead battery again.

Anyone have any ideas? A better battery? Maybe a retrofit for a regular size car battery?
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Old 04-28-14, 01:15 PM   #2
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Try the Costco battery that fits the RX400h. It's about $70 and has a 100 month warranty. I've had mine for 3 years now.

Mine will discharge if I let it sit for about 2 weeks, especially in cold weather.
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Old 07-02-14, 12:10 PM   #3
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We can leave ours in the winter time for 1.5 weeks with no issues. Always parked inside the garage (non-heated but insulated).
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400h , auxiliary battery , battery , hybrid , rx400h

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