Today I got to Attest what I have been preaching since ages.
This is Xolo Q3000.
It was my Primary phone a few years ago. Since last 2 years, It has been moved to Security Cam CCTV duty. The Humble Phone has been recording HD video day in, Day out. 24 hours on SD cars using a Dashcam app. I Am really impressed how the Memory and CPU have coped with this super heavy 24/7 load.
Yesterday, My Eye caught something amiss. The phone was swollen. It was still happily recording videos but battery was puffed up.
But the best thing was the Phone having an older (In my view Superior) design that has removable battery and back panel access. The Battery simply pushed open the rear panel. Now It was only 2 sec job to install another battery (Which I already had brought with the Phone) and Phone is ready and roaring Again. Its nice to see hardware from roughly 2014 performing well till date, Including original batteries.
Coming to swollen battery,
DId the Phone Explode? No
Did The phone Catch fire? No.
DId the battery overheat? No.
Simple open panel design allows Pressure and heat to escape as needed.
Unfortunately, Companies like apple taught us that Batteries should be glued shut with the phone. And Made as difficult as possible to replace. Also having no expanding space means that a modern phone with sealed battery might have exploded in above circumstances. All the other brands have followed suit.
BTW, I am sure you might have figured out where that Blue paint came from. Here goes.