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Do the packs get hot?
No
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Did you get 18650's with the built-in PCB (not that I think it'd matter)?
No, I bought just the 18650s and used the old PSION PCB
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I think there is a recalibration of each battery pack.
If I go to settings/power there is written "recalibration not done"
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That might require a hard reset and then leaving the unit for a few hours to recharge.
I tried to hard reset it putting a pin into the hole, but nothing changed. May be I need to totally reset the NP taking away main batteries and AA security batteries and power supply?
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FWIW (too late now), with the MP 2-cell packs I've rebuilt
Do you means MP or NP? If you mean NP you were able to rebuild two battery packs of Netbook pro? Did they work?
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I keep the tabs on and don't bother with the soldering (unlike your reference) if possible. There's enough tension in the tab to act as a spring and it avoids the issue of overheating the cell.
Overheating and possible explosion is a issue if 18650s do not have tabs, but I bought ones with tabs and soldering everything, was a matter of 5 minutes, with the help of my wife keeping together the pieces. With tabs there is no problem because the tabs are long and the heat takes a long time to move along the tab and reach the battery and also the tab itself dissipates much of the heat. Finally it is much easier and faster to solder a tab, so the trasmitted heat is very little.
Thanks