Swap to Lithium ion 12v battery.

[TheWizziard]

would switching to non-OEM battery void the warranty?

BTW: from pictures of under the rear seat in hybrid you can see the battery box, and it looks to be about phone book size.

Very little that you would do would "void your warranty"
If you do something and it causes a problem, then the problem is not covered by the warranty.

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