Indeed. The road to hell is paved with good intentions
Replaced the battery and the C port PCB on my N10+. The battery was more than just fading fast, it was bulging. Fortunately no damage was done.
Everything seemed fine until I realized there was no mobile connection, dead meat. Wifi worked.
After much accusing, hand wringing and consulting AT&T tech wizards it was determined that exploratory surgery was required. So my perfectly sealed phone was open for the 2nd time today. I was just thrilled.
Turns out the C port PCB was the International variant not the US one. Don't ask me how that kills mobile service but it does. It charges normally... SAMSUNG YOU runts!!! (I get my c's and r's mixed up when mad).
So put back in the old board... and everything's alright now. Jeeeesze.
Now the Battery wants to suck current up like no one's business and is fast charging normally.
I need to keep an eye on the charge temp now because it's once again capable of absorbing a lot of energy rapidly... and it is. Sweet.
As for the bulge, that was a rude surprise. It was only visible if you look for on the back cover. It's always in a case so I missed that cue.
Below is an interesting article on LI Battery failure modes:
Ansys battery design experts understand the chemistry and failure modes in batteries and evaluate which battery technology is ideal for your product.
www.dfrsolutions.com
Keep an eye open for battery swelling, replace asap if observed. Once it is bulged performance will also deteriorate most likely... especially if you have a cataclysmic failure event
The chances of an event happening is still small but increases with internal disarrangement ie the bulge. I full charged this battery many times after it was bulging (trying to calibrate) and it held.
I rather be lucky than good... and have a new battery.