{"id":4580,"date":"2025-04-08T09:45:58","date_gmt":"2025-04-08T09:45:58","guid":{"rendered":"https:\/\/www.tech-battery.com\/batteriesblog\/?p=4580"},"modified":"2025-04-08T09:45:58","modified_gmt":"2025-04-08T09:45:58","slug":"charging-phone-overnight-the-real-reason-its-bad","status":"publish","type":"post","link":"https:\/\/www.tech-battery.com\/batteriesblog\/charging-phone-overnight-the-real-reason-its-bad\/","title":{"rendered":"Charging Phone Overnight: The real reason it\u2019s bad"},"content":{"rendered":"\n

Smartphones<\/a><\/strong> are now so integral to our daily life. So much so that their batteries couldn\u2019t ever keep up with our daytime needs. (Why can\u2019t we get better batteries already!?)<\/p>\n\n\n\n

Which leads to charging phone overnight. Because what\u2019s a better time to recharge than when we\u2019re sleeping? But then the paranoia and fear come hailing down on us: overcharging phone<\/strong><\/a> and battery explosion. Leaving in us a dilemma we\u2019re all too familiar with \u2026But is it really bad to charge your phone overnight?<\/strong><\/p>\n\n\n\n

So you leave your phone<\/a><\/strong> charging overnight \u2026 what terrible fate awaits you? The Big Bang? The Reign of Fire? Neither. Your phone gets charged, just that. The myth that this overcharges your phone \u2013 oh wait we\u2019ve said it \u2013 it\u2019s A MYTH. At least since phones have evolved into smartphones<\/a><\/strong>. And as their newly-earned prefix implies, they\u2019re smart, in that they have an inbuilt protection chip that prevents overcharging<\/a><\/strong> at full battery.<\/p>\n\n\n\n

In place of the now-debunked overcharging threat is trickle charging. It lowers the current matching the discharge rate (or consumption) to maintain 100% charge level.<\/p>\n\n\n\n

During overnight charging, your phone constantly uses battery<\/a><\/strong> to stay functional, much like all things living; and when consumption happens, recharging happens. And this opens up to a hell of short-lived battery for whoever couldn\u2019t bear to replace their phones every year or two. (If you do, however \u2026 Well, you may skip this reading.)The Real Issues With Charging Phone Overnight<\/strong><\/p>\n\n\n\n

Most phones<\/a><\/strong> nowadays use Lithium-ion batteries (LiB). They\u2019re rechargeable and do so faster than rechargeable batteries in the past. They race to 80% in a flash, what with all the fast charging technology boasted by many a clashing smartphone titans (e.g., Huawei<\/a><\/strong> and Samsung<\/a><\/strong>). Owing to that, phones now take 1 to 2 hours top to fully charge. That\u2019s really saying your precious phone spends most time hooked to the charger at 100% battery while you\u2019re fast asleep. But \u2026 what\u2019s the deal?<\/p>\n\n\n\n

Stress on Lithium-ion battery<\/a><\/strong>. There\u2019s no arguing that Li-ion is superior among batteries. But a champion is not without its weakness. In fact, it\u2019s bordering counterintuitive: Li-ion suffers from stress when dwelling at full state-of-charge (100%). And when it does so consistently month after month, its recoverable capacity will drop; though the decline may not amount to much in the short run, it does leave a dent in the battery<\/a> capacity that will be a long-term thorn in your side.<\/p>\n\n\n\n

Adding insult to injury, it\u2019s not even advisable to fully charge a Li-ion battery<\/a><\/strong> for the same reason; what\u2019s more, prolonging it overnight? The closer it gets to 100%, the more degradation it stomachs. Generally, battery level outside the 20% \u2013 80% range will degrade the battery more. But what could be behind this counterintuitive existence?<\/p>\n\n\n\n

How Prolonged Charging Degrades Battery<\/strong><\/p>\n\n\n\n

Surely, you\u2019ve heard that Li-ion batteries<\/a><\/strong> are bound to decay since day one; everything they do \u2013 cycling, discharging, and charging \u2013 wastes away their lifespan. But that isn\u2019t to say the process couldn\u2019t be hastened or delayed by your actions.<\/p>\n\n\n\n

When charging, Lithium ions swim across the cathode (the positive electrode of a battery<\/a><\/strong>) to anode (the negative electrode), which is exactly how it should be. But it is during which that an irreversible damage also takes place: electrically-insulating rock-salts form & buildup over the cathode. Overtime, the buildup grows and battery capacity shrinks.<\/p>\n\n\n\n

The worst of all, the buildup blooms like wildflowers after rainy days at higher battery<\/a><\/strong> levels and temperatures. Certainly, maintaining a high battery level longer will degrade the battery faster. And this is even more harmful than cycling a battery.<\/p>\n\n\n\n

Which is why many, including Apple<\/a><\/strong>, recommend storing your battery at half charge \u2026<\/p>\n\n\n\n

To clarify, the problem isn\u2019t inherent in trickle charging but charging and high state-of-charge themselves. However, trickle charging lends itself to prolonging charging and high state-of-charge more than needed, more pronouncedly, in an overnight charging session.<\/p>\n\n\n\n

We may have phased out of the old Nickel-era, which condemned users to charge their devices fully on every session, lest batteries\u2019 cyclic memory forget their maximum capacity; now, Li-ion suffers from full charge<\/a><\/strong> instead.What about heat during overnight charging?<\/strong><\/p>\n\n\n\n

It\u2019s widely known that heat damages the battery<\/a><\/strong> capacity too. It\u2019s just less an issue concerning overnight charging because, well, it happens whenever you charge anyway. Most heat is stoked up before nearing 100% owing to fast charging; the low voltage of trickle charge means its generated heat is negligible.<\/p>\n","protected":false},"excerpt":{"rendered":"

Smartphones are now so integral to our daily life. So much so that their batteries couldn\u2019t ever keep up with our daytime needs. (Why can\u2019t we get better batteries already!?) Which leads to charging phone overnight. Because what\u2019s a better time to recharge than when we\u2019re sleeping? But then the paranoia and fear come hailing down … Continue reading “Charging Phone Overnight: The real reason it\u2019s bad”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2436,2460,2459,2433],"class_list":["post-4580","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-battery","tag-charging-phone","tag-overcharging-battery","tag-smartphones"],"_links":{"self":[{"href":"https:\/\/www.tech-battery.com\/batteriesblog\/wp-json\/wp\/v2\/posts\/4580","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tech-battery.com\/batteriesblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tech-battery.com\/batteriesblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tech-battery.com\/batteriesblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tech-battery.com\/batteriesblog\/wp-json\/wp\/v2\/comments?post=4580"}],"version-history":[{"count":1,"href":"https:\/\/www.tech-battery.com\/batteriesblog\/wp-json\/wp\/v2\/posts\/4580\/revisions"}],"predecessor-version":[{"id":4581,"href":"https:\/\/www.tech-battery.com\/batteriesblog\/wp-json\/wp\/v2\/posts\/4580\/revisions\/4581"}],"wp:attachment":[{"href":"https:\/\/www.tech-battery.com\/batteriesblog\/wp-json\/wp\/v2\/media?parent=4580"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tech-battery.com\/batteriesblog\/wp-json\/wp\/v2\/categories?post=4580"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tech-battery.com\/batteriesblog\/wp-json\/wp\/v2\/tags?post=4580"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}