Ammon News - There's something satisfying about waking up to a phone sitting at a full 100%, but that comfort is coming at a cost. Lithium-ion batteries, the ones inside virtually every modern phone, hate sitting at the extremes of their charge range, and parking yours at full power for hours every night is quietly putting it under constant stress. The end result is a battery that wears out noticeably faster than it has to, all in exchange for a habit you probably don't even need.

Keeping a lithium-ion cell pinned at 100% creates voltage stress, and the heat generated from sitting on a charger could end up meaning the difference between keeping your current phone a little longer or having to buy a new one. So once and for all, does keeping your phone plugged in really hurt the battery? Here's what the experts suggest.

It isn't about immediate damage but rather how fast your battery ages over time. Understanding the difference between what will and won't break your phone is key. Here is the truth about your charging habits.

The science behind battery wear
Battery health is not just about how many times you charge your phone. It is also about how it manages voltage, temperature and maintenance. Lithium-ion batteries age fastest when they are exposed to extreme levels: 0% and 100%.

Keeping these batteries near full charge for long stretches of time puts additional voltage stress on the cathode and electrolyte. This is why many devices use "trickle charging" or temporarily pause at 100%, topping up only when needed.

Still, the biggest threat is not overcharging, but heat. When your phone is plugged in and running demanding apps, it produces heat that accelerates chemical wear inside the battery. If you are gaming, streaming or charging on a hot day, that extra warmth does far more harm than leaving the cable plugged in overnight.


CNET