The battery might be dead. If it's not the cells themselves which are dead, it could be the battery management system, which is integrated into the battery pack.
How could it have died so suddenly??
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The genie inside the system went on an early Christmas holiday???
The battery you have taken a picture of, looks very similar to most batteries inside tablets that I have seen. I have fixed a lot of Samsungs, and yes - the batteries do die/short out, sometimes without any warning, or other signs.
The power pins I have checked/verified is the red/black ones, on the edges. The middle pins are typically for current monitoring, temp and data connections to the main systems CPU.
I have seen a shorted system, with a 'dead battery/no output voltage', come back to life after the battery was charged for a while. This reset the battery gauge inside, and the battery worked somewhat fine after that and the external shot was fixed.
If you try this, even without using a lithium charger - do monitor voltage/current/temps very closely. Those batteries are quite dangerous, and will easily catch fire/explode. I recommend never to walk away, not even for a lunch break.
I recommend extinguishing a fire, if it occurs inside on your worktable, by quickly power off and then placing/burring the battery in moist sand when it starts to heat and bulge up (50+ degrees C), or using a class-d extinguisher which made for metal fires <-- Messy. Don't breathe the fumes.
https://en.wikipedia.org/wiki/Fire_extinguisher#Class_D_dry_powder_and_other_agents_for_metal_firesFaults doesn't come in pairs of one - there can be multiple, or cascade faults - where the initial fault 'blows' everything after it. Most common in power stuff, but even (wet)dirt on an input pin can cause lots of trouble - even blow stuff up when/if it comes out of sync.
Good luck fixing it.
BTW - some stuff will not work without batteries, some will. Most laptops I own will run perfectly without the battery - could/can yours?