Bike won't turn on. What is the problem with Shimano BT-E8035 ?

[Future Paper]

My Merida stopped starting, maybe there is a problem with the battery. My bike was continuously charged for 3-4 days in a garage at -10 degrees. I came home and tried to charge it, but it stopped charging. After several attempts, the charging indicator came on and charging started. But the power button does not respond and does not turn on my motorcycle. What could be the problem?
- YouTube - Signal Battery

 

[Amber Valley Guy]

The small battery in the on/off button is discharged or dead. Your main battery didn't charge because it's to cold and the thermal sensor kicked in. You must be on the insane side of crazy to leave it charging for 3-4 days! Bring the bike or the main battery inside for a few hours before charging or heat the garage/shed to a least 10C. Trying to charge a battery at -10 C is user error/ incompetence.