REPLACEMENT BRAND NEW MBPro/ WORRIED ABOUT CALIBRATING

My son bought a new MBP on 4th january & the battery showed 100% but was only charging to around 3-4hours at the most,so he was advised to calibrate & since then the battery never showed 100% again & the time was decreasing,so we reset the SMC & re-calibrated but it was getting worse.
Today ,we had the MBP replaced & the battery is saying 100% and 5873mAh ,the last same model the 1st day said 100% at 5774mAh but after calibrating was falling to a full charge at95% but really low battery life,So, we are a little aprehensive to calibrate as the last MBP seemed to get worse,so we are very anxious to calibrate ,even tho its something ,it seems,we have to do.We just dont want the same happening again,any advice will be appreciated,thankyou.

Calibrating isn't something you must urgently do. It's purpose is to make the displayed remaining time, when on battery, more accurate and nothing more.
About Batteries in Modern Apple Laptops
Apple - Batteries - Notebooks
Extending the Life of Your Laptop Battery
Apple - Batteries
Determining Battery Cycle Count
Calibrating your computer's battery for best performance
Battery University

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    rustykerr123 wrote:
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