Your battery drains faster in the cold because low temperatures slow the chemical reactions inside a lithium-ion battery and raise its internal resistance. This makes the voltage drop, so the phone reads a lower percentage and can even shut down suddenly, often near freezing. The lost capacity is usually temporary and comes back once the battery warms up to room temperature.
Why this happens
Batteries rely on ions moving through a liquid electrolyte. When it gets cold:
- The chemical reactions slow down and the ions move more sluggishly.
- Internal resistance rises, which drops the voltage the battery can deliver.
- The lower voltage makes the phone think the battery is nearly empty, so the percentage falls fast.
- To protect itself, the phone may shut down even though real charge remains.
Is this normal?
Yes. This is basic physics and affects every lithium-ion battery, including phones, tablets, watches, and electric cars. Warmer devices simply perform better.
Does it cause any problems?
The reduced runtime and sudden shutdowns in cold are temporary and clear up once the device warms. However, charging a very cold battery, below freezing, can cause lasting damage, so it is best to let a cold phone warm up before plugging it in.
How to fix or check it
- Keep the phone in an inside pocket close to your body so your warmth keeps it usable.
- Use a case, which provides a little insulation.
- Do not leave the phone in a cold car overnight or out in freezing air.
- Let a very cold phone warm up to room temperature before charging it.
- Turn on Low Power Mode or Battery Saver to reduce demand in the cold.
- If the phone shut down from cold, warm it gradually at room temperature. Do not use a heater, hair dryer, or oven, and do not charge it until it is warm.
Frequently asked questions
Does the cold permanently damage my battery?
Simply using or storing a phone in the cold does not usually cause permanent damage. The risk is charging it while it is below freezing, which can harm the battery for good.
Why does it shut off at 30 percent in the cold?
Cold lowers the battery's voltage under load, so it can dip below the safe minimum even while the gauge still shows charge. Warming the phone usually restores that missing percentage.
Can I charge my phone in the cold?
Charge it once it has warmed up to normal temperature. Charging a freezing-cold battery is the one cold-weather habit that can cause real, lasting damage.