Is smartphone fast charging bad for phone batteries?

 Fast charging is a convenient way to top up your phone’s battery, provided your device supports it and you have a charger that can put out the power you need. But will this time-saving method negatively impact battery life? Let’s take a look together!

Fast charging isn’t inherently dangerous to your phone’s battery. A fast charger can’t “overload” the battery because the smartphone will only ask for as much power as the device can handle. This means you can safely use a USB charger that puts out more power at the device’s maximum charging rate.

Smartphone batteries can only use fast charging for a limited time. This is because lithium-ion batteries are charged in three stages: a slow “trickle charge”, a constant-current state where the voltage increases over time, and a final constant-voltage state where the current is slowly reduced to prevent overcharging and damage the battery.

Fast charging can only work in a constant current state, which is why many smartphone manufacturers promote fast charging windows, such as “charge to 50% in 30 minutes” and the like. Once the final constant voltage phase begins, charging resumes at the standard rate.

Fast charging may generate more heat

The faster energy is stored in a lithium-ion battery, the more heat is generated. This means that fast charging generates more heat than standard “slow” charging. This can be a problem because overheating can degrade the performance of Li-ion batteries. Fast charging may shorten the life of the battery compared to using a standard charger.

Most research into the heat generated by fast-charging lithium-ion batteries has focused on electric vehicle batteries, which are much larger than those in smartphones. The results of these studies suggest that certain fast charging methods degrade batteries at a much faster rate than standard charging.

Since extreme temperatures are the enemy of any lithium-ion battery, using the phone in extremely hot or cold environments or exposing the device to full sunlight can also damage the battery.

To get the most out of your battery, reserve fast charging when you need to quickly charge your smartphone. Use the standard charger at other times when you have free time.

Smartphone batteries are replaceable

The cost of replacing a smartphone battery is relatively low compared to the price of a new phone. Many Android devices have easy-to-use user-replaceable batteries, while others can be repaired by the manufacturer or third parties for a modest fee. Batteries degrade over time, even under ideal use. Knowing when the battery needs to be replaced (and how to improve performance) can be helpful.

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Thanks for reading, hope it helps!

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