"Here's the recipe I use to determine which cells are healthy enough to be usable. If any of you see something that could be improved, please let me know (I think I'm probably being too conservative, but don't really know for sure).
1. measure cell voltage. if it's less than 2.5v, throw it away.
2. charge the cell. if it gets hot during charging, throw it away.
3. measure cell voltage off the charger. verify it's between 4.1 and 4.2v.
4. wait 30 minutes
5. measure cell voltage. if it's fallen less than 4v, throw it away. Otherwise record the voltage.
6. store cell for 3+ days in cool, dry place.
7. measure cell voltage. if cell voltage has fallen more than .1v from the recorded voltage, throw it away.
Any cell that hasn't been thrown away by the time I'm through with step 7, I keep and put into my regular cell rotation.
EDIT: I'm no authority, but since nobody tried to correct me, I'm willing to assume that there's nothing obviously wrong with the above recipe.
Effetuato i test, ad oggi ne ho scartata solo 1(che perdeva 0.5v al giorno

), sono una bomba queste panasonic, una volta caricate in 4gg hanno perso al max 0.01v, e stanno tutte tra 4.10 e 4.15.
Qualcuno sa se c'è un modo di misurare la capacità (mAh) delle batterie usando un semplice multimetro (Lafayette DMB-10), non sono un esperto in elettronica.