Merced Summer Heat and Your Phone: How Heat Damages Batteries

October 18, 2026 · Battery

Merced Summer Heat and Your Phone: How Heat Damages Batteries

Quick answer

Heat is one of the main causes of early battery wear. In Merced summers, avoid leaving your phone in a parked car or in direct sun, and do not charge it while it is hot. If your battery drains fast, swells, or the phone shuts off, a battery replacement usually fixes it the same day.

Summer afternoons in Merced and the rest of the Central Valley often go well above 100°F, and a parked car gets much hotter than that. Lithium-ion batteries do not like heat. Every hot day wears them down a little faster.

What heat does to your phone

  • Faster battery wear: the battery holds less charge over time and drains faster.
  • Swelling: a badly worn battery can swell and push the screen or back glass out.
  • Shutdowns: your phone may show a temperature warning or turn off to protect itself.
  • Slow charging: phones slow down charging when they are hot.

How to protect your phone in the summer

  • Never leave your phone on the dashboard or in a parked car.
  • Keep it out of direct sun at the park, pool, or on the job site.
  • Take thick cases off while charging on hot days.
  • Let a hot phone cool down in the shade before charging. Do not put it in the fridge or freezer.
  • Avoid gaming or GPS navigation while the phone is charging in a hot car.

When to replace the battery

If your phone dies before the end of the day, shuts off above 20%, or the screen looks lifted, the battery is likely worn or swollen. A swollen battery should be replaced right away. Stop charging it and bring it in.

Book your repair

ART & FIX is at 1034 W. 18th Street, Merced, CA 95340, open every day from 8:00 AM to 8:00 PM. Our service is appointment-based, so call or text (209) 446-7200 or request an appointment online before you come. You get a free estimate before any work starts, and every repair has a 30-day repair warranty.

Need this fixed in Merced?Free estimate · Same-day for most repairs · 30-day warranty

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