About three weeks back I ordered two 40A tesiyi batteries from a certain vendor, when they arrived I left them in the respected boxes and put them away in my Vape cupboard. Yesterday I decided to start using them and I popped them into my d4 charger and let them charge fully, then I put them into my minikin and nothing, no power. Put them into three other dual battery devices and no power. I even tried one of them in my smpl mech mod and nothing. Now I have emailed the vendor and awaiting a reply to see what they say. But I just find it weird that both batteries are not putting out any power at all. Does anyone have any ideas as to what it could be or what I should do?