I think it's true

[LuckySevens4U]

One thing positive that I liked A LOT better with the 901 was the cartridge tips. They were NICE. Sleeker and thinner. Liked them much better than the fatter 4075 carts, but oh well.

 

[ApOsTle51]

Well I put the 901 batteries on my 4075 atomizer and they would not work. I tried it with both batteries.

As for the chargers, Queen, I think they work on both. The 901 was just rounded at the end and the 4075 was more retangular.

The reason behind some batteries not working is the height of the center contact in relation to the thread length.

I've had brand new classic batteries ( RN4072) where the center contact is too low and doesnt make sufficicient contact with the ( RN4072) atomizer contact. You can draw on it and the LED lights up but because the circuit isnt made it doesn't play ball.
I even tried reducing the thread length on the battery to allow it to screw in further and make center pole contact but the atomizer just bottoms out on the battery before contact is made.
Suggest if you get a battery that works but doesn't work ( if you know what i mean) just return it for a replacement , it can't be rectified, and i don't think its a cross compatibilty problem, just general bad factory Q.C.

 

[QueenInNC]

I have never had a 4075 atomizer not work on a 901 battery and vice versa. The 901 atomizers I have used have all lasted a while longer than the 4075 atomizers. Maybe its because the 901 does not get quite as hot and does not burn out as fast? I have had good and bad of both atomizers. 901's that vaped like a freight train and 901's that were just average. Same with the RN4075. I am on a RN4075 atomizer right now I got from Steve and its vaping like crazy and works perfect with my 901 batteries.


To use a 901 cart on a 4075 atomizer just use tweezers to pull the cart material out just a little. Then it will make good contact with the metal wicking bridge in the RN4075 atomizer.

I'd probably break it