Hope I understood your post correctly but with the pulled center pin, the battery will not charge no matter what. The center pin is required for charging. Remove the right angle adapter and plug in the AC adapter directly and it should charge.
It could be that the battery is dead. If the cells inside the battery drop below a certain voltage, they are usually useless. I believe the indicator LEDs on the battery packs indicate the voltage level of the pack. So if the voltage level is say 19.5V, all the LEDs will light up, but if no LEDs light up it may indicate that the battery has been discharged below a certain threshold and it will be more or less useless. Some batteries can be revived even when in this low-voltage mode, but that usually applies to individual Li-ion cells, not the entire pack.
Not sure what's going on with the alien head when the AC adapter is pulled, but are you sure you aren't confusing the color change that happens by default when the system is on battery with the color scheme when charging which is indicated by a slow color morphing of the alien head?
battery charging issues
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