Does fast charging reduce battery life?

[jtfwTX]

Hi all,

Does anyone know if the fast charging options for our device reduce battery longevity? I tend to keep my devices between 1 and 2 years. I routinely slow charge whether wired or wireless. Would appreciate any input or advice.

Thanks!

 

[donm527]

Yes. But will you notice the difference over 2-3 years? Most likely not.

 

[D.P.G.]

No, it does not the phone is designed to charge at the rated wattage output of the compatible charger, also it has a circuit that carefully monitors the charge cycle. It makes no difference if you fast or slow charge.

This is due to how fast charging works. Fast charging batteries have two phases of charging. The first phase is where they take in as much power as possible. The first phase is usually when the battery capacity is low or empty.

This explains why in smartphone marketing materials, you’ll see companies boasting about how their fast charger takes a specific amount of time to charge the battery from zero to some capacity.

But once the battery capacity reaches that quoted level, the charging speeds are reduced to prevent stress and heat that can damage the battery’s longevity. You’ve probably noticed your phone charges faster to a certain percentage, but longer to fill the battery; this is why.

It's also worth keeping in mind that your phone may automatically turn off fast charging if your device's temperature exceeds a certain level.

 

[jtfwTX]

Thanks so much for that very clear explanation!! Really appreciated.

 

[donm527]

https://www.androidcentral.com/fast-charging-could-be-slowly-killing-your-battery

Fast charging causes more heat while charging = affecting battery life even if your phone stops charging at 100% or if you have it stop charging at 85%.

https://www.nextpit.com/fast-charging-battery-damage#quick-charging

“Overall, Quick-Charging has no noticeable impact on the lifespan within the usual two years that it's designed for. After that, you may see a greater decline in battery health than you would with other usage.

So, we have to answer "yes" to the question of whether permanent Quick-Charging puts more stress on the battery and materials.