Continually discharging a battery below ~80% state of charge, or leaving it below 80% for more than a day or two will turn that discharged battery into a DEAD battery. The reality is, there are discharged batteries and there are DEAD batteries. It runs exclusively on electric energy until the battery is low enough to kick off a gasoline motor that recharges the battery. It was designed to be an affordable, everyday car. I would have to have a better idea of the test circumstances. The Chevy Volt is a hybrid electric plug-in vehicle that is EPA-rated between 38 and 53 miles of all electric range when new, depending on model year. The 9.6 might be a concern, depending on what loads are on as the car boots. Only then will you get a good sense of battery health. The real key to testing a battery health is to put a known controlled load on a battery for a given amount of time, measure the voltage under load, and measure the natural recovery. This is quite difficult to do in the real world, as most batteries are subject to small phantom loads all the time, radio, clock, smart key, key relay, alarm system etc. What is most important, if you are trying to determine the health of a lead acid battery, is to measure the voltage in an at rest state, neither being charged nor discharged, preferably after sitting several hours at rest. Also leaving a battery discharged is a sure recipe for destroying a battery quite quickly. In fact by discharging a battery, below about 12.4 vdc you risk permanently damaging it such that it's long term performance will suffer. I have noticed the car will always start at around 13.5 to 14.4, but after driving a while it will eventually fall into to 12.2-12.7 range. The Volt, with its solid electric-only range and utility-minded hatchback, will likely go down as an. People also have the misconception that when you draw down a battery (especially too far) that all you have to do is "pour" more electricity back in. The Chevy Volt is a plug-in hybrid electric car, where the battery pack allows a 35 mile or so electric range, with the gasoline engine providing power to extend the total driving range. Our point is, do not exclude or discount the Volt just because you think hybrids are scary. They are in essence, small chemical plants, that turn chemical (potential) energy into electrical energy. the visible spectrum several times over a large temperature range. Batteries don't store electricity, they MAKE electricity. been suggested for such applications as analogue volt meters and car speedmeters. It is important to understand how batteries work. If however it can be recharged and will hold the charge it is not Dead, but maybe dying! Dead in the sense that it can't support the loads intended. A forum community dedicated to Chevy Volt. Wordptom calculated a degradation of 6 for a 2015 battery size with a 10.4 kWh range, which may be indicative of the degradation of my battery (2014 Volt mfg in May of 2014). In this context, a battery discharged (in need of a recharge) to 9.6 volts is certainly "dead". Early 2017 Gen 2 Chevy Volt Premier (owned 2016-2019) - 2014 Cadillac ELR (2021-) - Tesla Model S 100D (2019-).
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