charging my battery doesn't go higher than 98%

[Trance]

is this normal for mbp?

 

[simsaladimbamba]

Yes. Look for the section called "Charging", but make sure to read the rest too.

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This should answer most, if not all, of your battery questions:
Apple Notebook Battery FAQ by GGJstudios
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[Elbert C]

is this normal for mbp?

That happens when you start charging the battery while it is 50% or higher.

 

[Trance]

That happens when you start charging the battery while it is 50% or higher.

can this lead to a problem? I keep my mbp charged 24/7

 

[simsaladimbamba]

can this lead to a problem? I keep my mbp charged 24/7

Yes, it is wise to use the MBP on battery from time to time. Maybe the FAQ I posted can shed some light on it, GGJstudios did thorough work in collecting all available data for frequently asked questions.