45W adapter reading as 50W in system profiler

Hi,
When using my 45W adapter, I've noticed that in my system profiler, under AC Charger Information, it says "AC Charger (Watts): 50." Does anyone know if this is normal, or if perhaps this could be causing my battery's full charge capacity to be diminishing?
Like many people, I've had problems with my battery losing power quickly, but Apple just sent me a new one yesterday, which within the day went from having a full charge capacity of 4400mAh to 4296. Can anyone tell me if this could be related to my "50W" adapter?
Thanks!

Welcome to the Apple discussions.
Can't help with why it's seeing 50, however, for your new battery, while Apple says you need to full charge/completely discharge it once for the lithium battery to know it's full capacity, most lithium batteries require two to three charge/discharge cycles to calibrate.

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