Radrover 6 plus battery charging problem

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Radrover 6 Plus
Battery Model number: APP00356 13INR19/66-4

The battery worked fine last summer, charging and all. The battery was stored indoors for winter, half charged. Checked it out occasionally during the winter, showed half charged every time.

Took it out today, checked it, nothing, no lights whatsoever when pressing the button on the charger.

Plugged it in to charge it, charger showing green light and the battery shows nothing while plugged in to the charger.

Any help or solution would be greatly appreciated.

Thank you
Serge