Hello, today my new laptop arrived (Acer Nitro 5 an515-45) also my first laptop (I used only desktop before) and it's battery is kinda weird? I mean it spikes from 4-5 hours to 2-3 hours, sometimes it shows 5 hours remaining then 2 minutes later me not doing anything it shows 2 hours remaining. Is it normal? There's an option on Acer care center to calibrate the battery (tells me it will last maybe a couple of hours until complete) should I do it? Thank you !