Our G2 Prius has about 150k miles on the odometer and continues to be rock solid. However, since it is used in an environment that is likely more stressful than average, and my away-from-home daughter may adopt the car sometime in the near future, I am wondering if I can gauge battery health and perhaps take action to avoid a precipitous email in the future. My first thought is to use a reader to meter the voltages of each module pair when the battery SOC has been drained to low to identify weak modules. This is just a WAG, and I am hoping our collective wisdom and battery experts can help come up with a decent test. Decent would mean: Battery stays in-situ for the test; Metering equipment costs < $100; Both single module and diffuse wear patterns can be identified; Test able to identify with > 90% accuracy, battery that will likely fail within six months. Thanks all!