Putting less stress on the electrodes results in less degradation, and ultimately higher capacity for a longer period of time. SEI buildup reduces the overall capacity of a battery.”Ĭharging your battery to full capacity less often, and not letting it run totally dry, can extend its life-somewhat. “That ‘pooling’ is the SEI ( solid electrolytic interface) buildup on a battery. But trying to force a nearly saturated sponge to absorb the very last drops of liquid requires pressure, and likely leaves more liquid pooled on the surface,” he said. “It’s pretty easy to fill a sponge from dry to mostly saturated. Former Wirecutter senior staff writer Kevin Purdy-now of iFixit, a site that documents how to repair common electronics and other household items-suggested the analogy of a sponge. That is especially true when you’re topping off a battery the last few percentage points. “The lithium ion needs some space in the electrodes and the electrode has to make this space, and because of the stress … the electrodes will gradually degrade and that is also then a loss of capacity in the battery,” de Vries said in an interview. Moving those ions puts stress on the electrodes and leads to reduced battery life, according to Hans de Vries, senior scientist at Signify (formerly Philips Lighting), where he co-authored the research paper “ Increasing the cycle life of lithium ion cells by partial state of charge cycling,” which appeared in the journal Microelectronics Reliability. The ions move in one direction when charging and the other when discharging. Smartphones are powered by lithium-ion batteries, which work by moving charge carriers (in this case, lithium ions) from one electrode to another. What the science saysĬharging your battery causes its performance to degrade over time, no matter how you do it. Personally, I keep my iPhone on a Qi wireless charger on my desk all day while I’m at work, and I juice it up overnight, as well.Īfter speaking with battery researchers and the reuse experts at iFixit, reviewing studies on phone replacement trends, and analyzing some user data from Wirecutter staffers, we've found that although micromanaging your phone's battery can likely extend its life to a small degree, the results might not be worth the inconvenience in the long run. Others fastidiously keep their battery between 40% and 80%, never allowing a full charge, under the belief that the battery will last longer as a result. Some people just plug their phone into a charger (or toss it on a wireless charging pad) whenever power is available. Even with that experience under my belt, it has never been totally clear to me if being careful about how often I recharge my phone actually extends the life of the battery enough to make a difference, or if it’s just another hassle in a world with far too many of them. I’ve been writing about phones and tech since 2011, and before that I was an iPhone sales specialist at an Apple Store. If you’re unsure whether there’s a “right” way to charge your phone-or whether charging it too long, too often, or too fast can damage the battery-you’re not alone.
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