interesting observation about li-ion cells

turbodog

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I love noticing trends (wish I was better at it with the stock market).

Now I don't know the exact chemisty of a nicd and li-ion cell, but they appear to be related.

nicd:
.9v considered dead, do not discharge below this
1.2 considered good, nominal voltage
1.4 considered peak voltage, right after being charged

li-ion
2.7 dead
3.6 good
4.2 full charge

Has anyone noticed that these are exact multiples of 3 of each other?
 
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