New AC180 not charging to 100 percent

I unboxed my Bluetti AC180 that I got for Christmas I plugged it in and am charging it for the very first time. It is at 99 percent and has been there for over two and a half hours now. Is 99 percent considered a full charge or should it read 100 percent. Wondering if I got a defected unit. Please advise. Thank you.

Apply a decent load and run your 180 until it reaches 0% and shuts down. Immediately recharge and it will go to 100% after running a complete cycle

Correct. The Battery SoC only works precise, when you calibrate the unit once. For best results, charge the Unit with a constant current via AC and discharge it too with a constant load @Hagar