The key to lithium ion battery life is the charger. Had an 06 Toyota Highlander hybrid. Bought used with 60k miles and traded it at 90k in 2013. Loved it. If I remember right, Toyota is very careful not to overcharge it and the system tries to keep it fully charged. I am thinking they charge to only 85 to 90% and maintain it there. You may want to rethink once a week charging. NYC hybrid taxi cab have run 300,000 miles.
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