Vamo just showed 5.7 v instead of low with 2 efest imr 18350s, should I be concerned?

[YogurtSoda]

I was using my Vamo as usual today, with 2 efest imr 18350s. Placed it down for a while and when I went back to it, I noticed it was firing very weak, check the battery voltage and it showed 5.7 volts If I'm not mistaken, it should have showed low voltage at around 6.8ish(?) volt range when using stacked 18350s. Was this an issue with the Vamo or with the batteries? Should I be concerned about this?

Just for reference, everything is about a week old at most and the Vamo has an Igo-L on it. I put some freshly charged batteries in it (once again, 2 efest imr 18350s), and am waiting to see if that issue will happen again as I use the Vamo.

 

[Kemosabe]

try measuring each batt separately. if you get a reading of less than 3.2v, personally id chuck the batt and contact the seller of the batt.
i had a 14500 trustfire that went all the way down to 0.0v. scared the heck out of me. i contacted the seller and they rushed a new batt to me, no questions asked.
personally, i only use AW brand batts. iv enever had a problem with them.
panasonic batts are also condisered to be top of the line. although i do hear good things about the efests..

 

[YogurtSoda]

I tested the batteries with a multimeter and they are fine.