![]() ![]() So, if you had a 100Ah car battery, and your phone’s battery was 1.8Ah (which is equal to 1800mAh), a completely dead handset would pull less than 2% of the charge out of your vehicle.ĭepending on the circumstances, that could be enough to drain your car battery dead. ![]() Charging your phone via your car is “simply energy transfer from your car’s battery to your phone battery,” says Duffy. ![]() “If you think of it like a car, it’s almost like your gas tank gets smaller every year.”Īnd speaking of cars, there’s still that pesky question to answer. “If someone charges their phone every day, and they keep that phone for two years, they’ve only got 80% of their initial capacity left,” says Duffy. For instance, after 200 charge cycles (a cycle is the cumulative equivalent of bringing a battery from 0 to 100%, or charging your half-dead phone twice, for instance), your smartphone battery will only have 95% of its original capacity left. While it was recommended to drain older batteries (like nickel metal hydrid or nickel cadmium cells used in 2000-era cameras) to 0%, today’s batteries - because of the three charging phases - shouldn’t be allowed to dip too low.Īnd if used frequently, the fast-charging constant current phase can actually reduce your battery’s capacity more quickly. Keeping lithium ion batteries well-charged can help extend their life, says Duffy. “As long as you can maintain that voltage, it’s basically like topping off the tank,” he says. At this stage, which runs from 70% to 100% on your battery meter, says Duffy, it doesn’t really matter much what kind of charger you’re using. ![]() If you have a good charger, it can fill your battery’s capacity very quickly, drawing in power at higher currents.Ĭonstant current mode continues until your phone reaches about 70%, and then it switches into a constant voltage mode. “This is where you see the biggest difference between battery chargers,” says Duffy. But once it reaches a certain threshold - it could be 3.1 or 3.0 volts - then the charging process switches to a constant current mode. ![]()
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