Some updates!

I just bought 6 different BL-5J batteries So I have "meat" to feed my developing charger without blowing up the good original battery.

BUT, I'm having soma strange behaviour with some of the FAKE batteries:

When they are charger and left on the bench they became sensibly... COLD!!

Really!

A discharged fake battery is at room temperature (the table is wood).

The orginal nokia battery, charged or discharged is at room temperature.

A CHARGED fake battery is sensibly COLD.. I'll try to read the temperature in some way, but at the touch it'ws definately colder than anything else laying on the table.

Weird issue!

As a note, I noticed their lower temperature also when charging, but I was thinking at some thermal reaction of Lithium (still documenting).

I know NI-CD become hot during charge (and hotter at the end of charge) and Ni-Mh become slighty colder during recharge (they absorb heat during recharge as reaction).

Let me know if anybody experienced some of this (expecially dr_frost_dk).