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Best Battery Calibration App?

I bought a spare battery for my Note 4 and I was wondering if I should calibrate them both first of all. Also, should I calibrate them each time I switch them out? I ask because the spare battery is a little different as far as the labeling. It's close, but same mAh, voltage, etc. And the spare seems to discharge a little more quickly.

Finally, is it bad to charge this phone, for these batteries I should say, with a charger that is different from stock, and charges at 2.1 amps? I figure it's not a big deal because the note for charges at 5V and 2A, but don't want to damage the battery, so thought I'd make sure.

Thanks in advance.
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