auxiliary 12 volt battery (battery which starts the car)

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My 2011 RX450h has 40,000 miles on it.  The auxiliary  (battery that starts the car) battery is original.  Lexus service tests the battery at each service interval and the battery tests good.  Eight years is a long time for a battery to last.  As I understand it, the original battery is a glass based battery; not lead.  This type of battery usually last longer, but I do not want to wait for the battery to die and be left stranded.  Any of you with Lexus hybrids have any input regarding at what point you replaced the auxiliary (the one that starts the car) battery? Thanks!  

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