Since you can’t fight chemistry, your smartphone battery has a limited lifespan, but you could make mistakes that reduce your phone’s battery capacity faster. For example, letting your phone reach 0% is a huge no-no that you’ll regret once the battery degrades. Does nighttime charging have a similar impact on battery health, and should you combat this by opting for fast charging in the morning?
In short: no and no. While it’s not recommended to let your battery reach 100%, the idea that this will cause rapid degradation is one of the most common battery myths still propagated online. This may have been a problem in the past, but modern phones have features that stop charging around 80%, minimizing the time your phone spends on a full charge. In other words, nighttime charging is perfectly safe.
Fast charging, on the other hand, is very nifty, but it uses the battery a little faster. This doesn’t mean you should abandon it completely. Instead, try a combined approach where sometimes you charge it overnight and other times you top off the device with a fast charger. It’s also not the end of the world if you charge your phone quickly before you leave for work.
Why charging your phone overnight isn’t a big deal
When it comes to the science behind lithium-ion batteries, temperature is what harms your battery the most. A Li-ion battery charges when ions slide between an anode and a cathode. The higher the power, the faster the movement. This is how fast chargers work. They increase the power, thereby speeding up the speed at which these ions migrate. The side effect is that it also increases internal temperature, as this can break down electrolytes and decrease overall capacity over time.
So if you use a regular charger and don’t cover your phone with a bunch of blankets at night, you’re safe. Smartphones usually have intelligent battery management, which can stop charging once the battery reaches full power. Leaving the battery at 100% is harmful in theory, but iOS and Android devices can delay fully charging based on your routines, eliminating this particular problem.
Now that we know that overnight charging won’t harm your battery health, what about the occasional fast charge? Theoretically, frequent use of a fast charger can heat the battery and lead to a gradual loss of capacity. However, the effects of fast charging are negligible, representing a decrease of less than 1% compared to the slower method. To get the most out of your phone’s battery life, keep it above 20% and below 80% charge, and don’t let it completely discharge, especially if you enable the phone’s optimized charging features.
