no I charged it to 4.2v. it sat 24 hours and was at 4v with no further charge. just sitting after fully charged for 24 hours. you know what else? these are not lasting at all. I am a heavy vaper but they are down to 3v in 10 ml. i have no idea what is with the ones i got. maybe bad lot. or that could all be normal i don't really know. i would say they last like efest 1600's. given my very first post about them i am thinking something is wrong. perhaps i should toss them while i am ahead?
Dropping from 4.2V to even as far as 4.1V could be normal (although seems a little much). 0.2V seems outside of the norm. I generally see a 0.05V drop after a charge, at most. Li-ions have a particularly low self-discharge, it is one of the nice things about them.
They should be lasting longer than that too. It sounds like they have gotten a higher internal resistance than they should have. This is hard to test without a specialized meter.
I generally look at the charger first in a situation like that. If they are coming off at 4.2V, though, I dunno. It could be that they are charging at above the max charge current, but still terminating at the correct voltage with the saturation charge, but VTCs can take a 4.0A charge current, so that seems somewhat unlikely.
If you aren't draining them over their amp limit, I dunno. Extreme temps maybe?
It is always possible that you got a bad batch. I have quite a few VTCs, and they are all great, but QC issues happen to the best of manufacturers at times.
