Calibrating with battery removed?

Quick question.
When you drain the battery for calibration purposes and it eventually dies, it states to leave the laptop alone for five hours or more before plugging the power back in and charging up.
Can I instead remove the now exhausted battery and run the laptop purely on A/C power?
This is what I did last night and left the battery on my shelf overnight. I don't however know how to tell if the thing calibrated or not
In case it helps:
Battery Information:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 1119
Remaining Capacity (mAh): 115
Amperage (mA): 1502
Voltage (mV): 12501
Cycle Count: 36

OK that makes sense.
However, my laptop does not sleep. It literally loses all power without warning.
It has done so several times between 75% and 90% power remaining.
Last night I performed a PVRAM reset then allowed the system to operate on battery. When it went down to 75% remaining the battery immediately went down to 25% remaining and a warning came up. Ten minutes later it had 7% power remaining and I lost all power again.
I have this morning performed an SMC reset and it is currently charging. I am not sure whether this will fix the problem or whether I really have a faulty battery. Any further suggestions welcomed of course.

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