Good link, Vapen4joy takes you to the info page and if you click on downloads you can get the manual.Perhaps?
Looks like when all three lights are lit, it's fully charged.
http://charger.nitecore.com/product/intellicharger-i2
There charged, I have a charger exactly like that. You can believe it.Hi,
I have a nitecore i2 and 2 18650 VTC3 batteries.. i got them from friend who told me the light will turn to green when fully charged but they have charged fairly quickly and they are 3 solid lights now. I am unsure if they are fully charged???