Charging the phone using currency note

Few days back i heard from my friend that someone had done the Charging of phone using the currency. I thought of finding how is it possible to charge a battery with a note. with some help from Google God, landed in the answer why it shows its charged.

Taken from the link --

http://highontechagain.com/2010/01/myth-buster-charging-your-nokia-phone-using-a-currency-note/

You don’t really charge the battery but you just cheat the phones software/firmware to show the battery meter as full. Now the question is how did that happen? Well, when you insulate the ‘center pin’ of the phone using the note all you do is stop the phone from reading the "drop in EMF" of the battery. You are keeping it on a ‘floating’ state and the phones sensors gets confused. And when you suddenly pull the paper out, the phone switches on using the momentary ‘full EMF’ signal from the center pin, which cheats the phones circuit into thinking that its running on a fully charged battery! You place the so called ‘FULLY-CHARGED’ battery into another phone and voila, the phone won’t switch on!! Where does the “Full Charge” go?? The answer to the question is simple:
When a phone shows a battery as "LOW", it still has quite some charge in it. A drop of 0.6V is only needed to show a poor battery warning as any further drop in a Li-ion battery may damage the battery permanently. In this case the ‘fooled’ phone is using the remaining battery power (charge) to drive the phone, which can be bad for the battery in the long run. This happens only with few Nokia models, as other manufacturer’s software and battery’s EMF reading circuits are different.

So this explains :D...