iphone 6s battery fire

I have an iPhone "6s plus" that I have had since new and is now
just a few months past its 1 year warrantee. I found very poor battery
performance as of recent and by mid-day my battery would be around 40% with
nominal to normal use. This was not the case for the first year and found it
performing well until recent.

I inquired with my provider and was informed that it is out of warrantee but
they offered for a fee to change the battery. This is where my
"guilt" comes in but something tells me I shouldn't and that apple
has a great risk and liability here? I opted to replace my own battery finding
a new replacement on amazon. I have replaced older models of iPhone batteries
before on my own and do so very carefully. I opened the phone and disconnected
the battery wire. I then with the plastic tool that comes with the battery,
gently started to remove the battery from the sticky tape holding it in
place. within the first movement of the battery, almost immediately, the
battery burst into a very high temperature flame extending
8"-12" high, incinerating the entire interior of the phone
within 5 seconds, while filling my home with toxic smoke from the chemical burn
occurring. I burnt my fingers rushing it to a safe spot at our stove, to finish
burning as it was occurring to prevent my kitchen in going up in flames.

I get that removal of the battery is not promoted by Apple as a
"do it yourself", but is a service by apple and many of their
dealers. As many users would agree, their phone is part of their (business)
life and down time is painful thus I figured doing it myself was best. But
if the battery is really a ticking time bomb that with any physical
movement will cause it to burst into flames, not only destroying a nearly
$1000 device, but risk fire to my home and injury or worse to my family!

I worry for anyone else that may do this, as there are many... that if this
is truly a normal expected risk by apple, then why this is not clearly
warned on the face of the battery that any slight movement of the battery
can cause serious fire and or injury. With such warning I would never have
put that risk into destroying an expensive electronic and or risk injury and or
property damage just to change a battery.