Hi and thank you for your question.
I would like some more details on this symptom if you don't mind.
First, this is NOT normal, so we can fix it, we just need to find it first. There really aren't too many variables here either.
My first question is, how old is the battery, and what brand is the battery and what size (designation on the side) ?
Have you put a load tester on the battery to see what condition it is actually in? This could be a battery issue or a key off drain issue. Both produce the same symptoms.
Now we need an ammeter. Most VOM (volt Ohm meter) have a 10 amp scale which is plenty for what we need.
Disconnect the negative cable from the battery and connect the ammeter in series (use the meter between the negative cable and the negative battery terminal) and take a reading, key off. Let me know what it shows for amp draw. You do NOT want to start the bike with the meter installed between the cable and the battery. It will draw too many amps and damage the meter. You can hold the cable against the battery to start it however, and once it is running, then the amp flow is small enough that it will be less than the 10 amp max of the meter.
Let me know about those points and we can go from there.