Hi, sorry for the delay.

The VC8 can reach 3A when the battery is charging in slot 1 or 8. Max 2A when charging 2 batteries and 1A for charging 4 batteries. If all the slots are populated then it would be 0.5A for each slot.

Yes, the VC8 can charge 26650 battery and the current depends on if other slots are charging batteries or not.

In general, it can charge from any type-c cable but we suggest to use XTAR brand cable.