New 12V Battery Slays One Tesla Owner's Energy 'Vampire'
Late last month, David Noland noticed that his Model S electric car was mysteriously losing range after it was charged and sat unplugged overnight. He suspected that something - an energy 'vampire' in his view - was sucking power from his car's battery, reducing its driving range the next morning by 15-23 miles.
He wrote about for Green Car Reports, which got the attention of Elon Musk and his team, which analyzed - remotely and without Noland's knowledge - data from his car and determined the cause of the problem: a defective 12V battery.
I was completely unaware of any problem with my 12-Volt battery. (I wasn't totally sure my car even had a 12-Volt battery.) But apparently Tesla's remote monitoring system had detected some sort of anomaly in the electrical readings from my car.
I agreed to let Tesla replace my battery, of course. Two hours later, a couple of Tesla "Ranger" technicians showed up at my house, and replaced the battery with an upgraded Exide model.
They also downloaded software version 5.8(1.49.25) to replace the earlier version of 5.8 I'd received only the previous week. And then they were gone.
That appears to have solved the problem for his. Now the loss is a far more acceptable 1.1kWh per day, roughly the equivalent of having a 100 watt light on for half a day.
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