Please do not use these batteries, if you purchased the unit within the last 14 days we will replace them. Just send us back the old ones.
They haven't seen any actual solid use in the unit, I only checked to see if the light turned blue for a second and then I put them away. I've been using a different set of 18350 Protected batteries for 7.4v and only had the Ultrafire ones sitting in my closet for use as backups after the 18350s I bought from Madvapes have been put through their paces. Earlier today I trashed the modded backup battery which wasn't cut properly and placed an order for a second set of 18350s to be designated as new backups.