Hello Thomas,
Welcome to the forum.
When you posta technical question, its really helpful if you can include the make and model of mover do you have? and how old it is. Someone may have had a similar experience.
Regardless of that detail though, that seems a very fast battery drain, so it suggests there is a fault in the hand set.
Is it still in warranty? if so you should contact your seller to get it repaired/replaced
Alternatively, and I know we are in lock-down, and they may not be at work, but
have you tried contacting the manufacturer, Some are very helpful.