I have just returned to my N900 after flirting with some other devices. Installed a new polar 1500 mAh battery. It was charged three times before I found this post while updating the device with all the great stuff people have come up with since I last looked.

Installed bnf. No problem. Followed the excellent calibration post - everything happened exactly as you said.

Now on the second discharge cycle. Full Charge has gone from 2000 mAh (or something - i did not take a screen shot) down to 1782 mAh and I suspect, as you say, that another one or two calibration cycles will bring it down the the real capacity.

My question is: On the charge after the first calibration cycle I was monitoring the device using bq27200, bnf and grepping the battery stats. I unplugged the device when bq27200 and bnf said the battery was 100% full. I did this as I was not sure and could not find any info to the contrary. However the battery stats showed that the battery was only at 66% charge!! The battery was still charging and flashing the orange LED. BUT shortly after being unplugged when I checked again - showed 97%.

So should I leave the charger connected until i get the green LED or should I do what I did and remove the charger when bnf shows that battery to be full (with the expected mV values etc)?

I am not using and special charge scripts like charge21.sh. Just bme. I also could not find a post giving a real insight into the pros and cons of stopping bme and using charge21. (Apart from not having the automatic shutdown happen before you get EDV1 = 1 which i have not had a problem with)