It’s always worrying when your phone feels warmer than it should, but there are levels of severity. Slight warmth after a long streaming session is usually fine, but scalding heat and a burning odor are the most concerning. If this happens to you, it’s a sign that shouldn’t be ignored.
There are several components that can lead to that weird smell when a phone overheats — and it’s not always about the battery.
That “warm computer” smell — nostalgic and usually harmless
If you used a beige desktop PC in the late ’90s or early 2000s, you may recognize what some people call the “warm computer” smell. Smartphones can give off a similar scent. This typically comes from dust being roasted by hot components or warm plastic. For a smartphone, that usually comes from the charging port — a perfect gathering spot for dust and lint. The good news is that’s usually all it is, and you can fix it by carefully cleaning out the port. If the smell persists though, it could be a sign of something worse.
Burning rubber or plastic — sometimes temporary, not to be ignored
If the plastic scent is strong, or it smells more like rubber, this can be a sign of something going wrong with internal circuit boards or wiring. New phones can sometimes emit subtle odors as internal components “bake off” manufacturing residue. If this smell doesn’t go away after a while, it could mean something more serious is happening inside the phone — possibly an electrical short on the circuit board or wiring. When the smell gets stronger, it’s time for further inspection.
Code red — take this seriously
The most dangerous component in a smartphone is the battery. If you remember the Samsung Galaxy Note 7 debacle, you know the damage they can cause. Faulty batteries have been known to explode and burn down houses. The smells that accompany a failing battery have been described as “sweet,” “metallic,” like nail polish remover, “chemical-y,” and even “fishy.” These come from VOCs and the fluid inside lithium-ion batteries. If the battery is punctured and leaking, you have an extremely serious problem.
Early warning signs of battery failure include dramatic drops in battery life, erratic battery percentage readings, and random reboots. Things can eventually escalate to overheating and the battery swelling enough to separate the back of the phone from the frame.
Listen to your nose
Regardless of the specific odor, it’s important to pay attention. Phones aren’t supposed to smell at all — so don’t ignore the message. The first thing you should do is unplug the phone if it’s charging and power it off. Let it fully cool down before trying to turn it on again. If the problem persists, you’ll need to seriously consider replacing your phone. Most carriers or manufacturers will send a replacement if you can prove it’s malfunctioning. Just don’t expect the problem to go away on its own.
