Google Pixel 8 Pro: Overheating and Swollen Battery Diagnosis

WARNING: This device contains lithium batteries. Improper puncturing or bending during disassembly can cause explosions or flames. The intervention requires precision and specialized technician assistance is recommended. ReeFix provides this diagnosis EXCLUSIVELY for educational and informational purposes.

BEFORE THE FAILURE

The Google Pixel 8 Pro, like many modern smartphones, is constantly under thermal and chemical stress, especially with fast charging cycles and intensive use. Often, before swelling becomes evident, a progressive reduction in battery life and a slight abnormal heating during use or charging can be noticed. This condition, although initially perceived as normal wear, is a precursor to degradation. Prolonged exposure to high temperatures (e.g., leaving the phone in the sun, intense gaming while charging) significantly accelerates the internal chemical decomposition of the battery.

AT THE TIME OF FAILURE

The device started to overheat significantly during charging. Simultaneously, or shortly after, a "swollen battery" error message appeared, or a physical bulge was noticed on the back of the phone or the screen, which appears raised or detached. This is the unequivocal sign of an internal deformation of the battery pack, caused by the accumulation of flammable gases produced by anomalous chemical reactions within the lithium cells.

AFTER THE EVENT

The phone continues to overheat and the battery is swollen. The error persists. It is crucial not to continue charging or using the device under these conditions due to the high risk of fire or explosion. The internal pressure exerted by the swollen battery can irreversibly damage the display, motherboard, and frame of the device, compromising its safety and functionality.

Causes & Probability

1. Defective/Degraded Battery: 75%
   • Why: Swelling is the direct and most common evidence of internal chemical degradation of the lithium-ion battery. This degradation is often accelerated by overvoltage during charging, excessive thermal stress, or manufacturing defects. The gases produced by these anomalous reactions cause the physical deformation of the cell.
   • Key signs: Swelling (raised back or screen), "swollen battery" error message, localized overheating, rapid discharge, reduced battery life.
   • Often happens when... the device has undergone frequent fast charging cycles, has been exposed to excessive heat, or has exceeded a certain number of life cycles.
2. Charging Circuit Malfunction (PMIC or USB-C port): 20%
   • Why: A defective PMIC (Power Management Integrated Circuit) on the motherboard or a damaged USB-C port can cause unstable/excessive current or voltage delivery to the battery. This overload or inefficiency generates high heat, accelerating battery degradation and swelling.
   • Key signs: Intense overheating only during charging, difficulty connecting the cable, signs of corrosion or damage in the USB-C port.
   • Counter-examples: If overheating occurs even without charging or the battery is swollen without specific charging problems (e.g., it charges normally but swells).
3. Non-compliant/Damaged Cable or Charger: 5%
   • Why: Non-original, poor-quality, or damaged charging accessories may not meet the voltage/current standards required by the Google Pixel 8 Pro. This can lead to overload, inefficient charging, or excessive heat generation, contributing to battery stress and swelling.
   • Quick checks: Try using an original, certified, and functional Google charger and cable, but only for a brief test and with extreme caution given the battery's condition.

Quick Checks (for the user)

1. Immediately disconnect the device from any power source.
2. Do not attempt to turn it on or recharge it.
3. Check for swelling: Is the back of the phone or the screen raised or showing gaps along the edges?
4. Do not attempt to force the device closed if it is open or deformed.

Safety Notes

• Do not attempt to puncture, bend, or press the swollen battery. Handle it with extreme caution. The trapped gases are highly flammable.
• Store the device in a cool, dry place, away from flammable materials and out of reach of children or pets.
• In case of smoke, unusual odor, or excessive heat, move the device outdoors and call emergency services.

Tools Needed (for a technician or experienced user)

• Google Pixel 8 Pro Battery
• Smartphone Repair Tool Kit
• Adhesive strips for Google Pixel 8 Pro
• Heat Gun or Hair Dryer (to soften adhesive)
• Plastic opening tools (spudger)

Technician Output

The Google Pixel 8 Pro shows overheating during charging and a "swollen battery" error, with probable physical deformation of the battery pack. The priority is the safe removal and replacement of the battery. Subsequently, it is crucial to check the USB-C port for damage or corrosion and test the PMIC (Power Management Integrated Circuit) on the motherboard to ensure proper voltage and current regulation. A motherboard inspection is recommended to rule out liquid damage or burnt components, as well as a software diagnostic for any charging or thermal error logs.

Operational Decision: If the battery is swollen, the device must be immediately turned off and no longer used; contact a specialized technician for battery replacement and charging circuit verification, as DIY repair presents high risks without adequate experience and tools.