01 August 2018

Causes of phone battery bloating / swelling

Lithium Ion batteries are known to function poorly when subjected to heat. It turns out that it's not just function that declines, but gases formed by electrolyte decomposition can cause the battery to bloat and potentially explode.

Few causes I know of are:

  • Using the phone for a phone-call while the phone is being charged.
  • Using the phone in a hot environment or subjecting it to heavy use (watching videos or gaming) while it is being charged.
  • Using mobile hotspot for long durations (more than half an hour) at a stretch.
  • Continuing to charge the mobile even after it reached 100% charge.


I'm surprised that many phones today have a moulded build with a non-removable battery. Although the battery can be replaced at a service center, the "non-removableness" means that if the battery gets bloated, it won't have any space to expand into, and it'll permanently damage the phone. The better option is to go for phones with removable batteries. Here, when the battery expands, it'll pop off the back cover and at least your phone's components won't get damaged. You just have to replace the battery instead of replacing the entire phone.

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