Our 2011 RX struggled to start - only 18 months old. At recent stop at our recycle center, it barely started. I drove right over to local Sam's Club and bought a new one (Lexus Dealer is 1-1/2 hours away). Auto tech at Sam's said they've been replacing many of the 'Toyota Service' batteries. Beware - see your dealer if your RX struggles to start.
Bill - N. Carolina