Should I disconnect Apple Pencil Bluetooth when not using?

I find my Apple Pencil loses charge without me using it. Seems like (but probably conincidence) that every time I want to use it, it has no charge.

I’m wondering if I’m supposed to remember to disconnect it from the iPad’s BlueTooth Connection when storing when not in use?

Or other tricks to stop losing charge during non-use? Or maybe it’s a flawed device.

Same question: which version?
My “v2” can’t lose a charge since it is always connected to the iPad that charges it.