Most 901/KR8 batteries and atomizers are interchangeable. I say
most because there are always 3rd party manufacturers out there that produce variations on both models and they may use different threading on screws, but I haven't personally encountered this.
Important to note is that the default 901 batteries are 180mAh and default KR8 are 280mAh. The KR8 XL batteries are 380mAh. That results in the following combinations:
901 battery on a KR8 cartomizer = Weaker vapor production (than using a standard KR8 battery and cartomizer) and may result in difficult draws from the unit.
- Some may actually prefer this if using a standard KR8 is too strong.
- Because the head on the 901 battery doesn't have slotted venting like the KR8 batteries, using a cartomizer results in much stronger resistance when taking a draw.
KR8 battery on a 901 atomizer = Stronger vapor production (than using a standard 901 battery and atomizer) and unit may heat up more.
- Because the 901 doesn't offer a mega battery the way the 510 model does, many see using the standard KR8 (280mAh) battery as the only mega option for the 901.
- Because of the increased battery output, vapor production increases, but so does atomizer heat. Extra effort needs to be made not to block the single vent hole on the atomizer or the atomizer could heat to the point of burning the user or ruining the unit.
KR8 XL battery on a 901 atomizer = MUCH stronger vapor production (than using a standard 901 battery and atomizer) and unit
will heat up more.
- As with using a standard KR8 battery, many see using the KR8 XL as a way to go beyond anything a standard 901 can offer. Some users combine a KR8 XL battery (380mAh) with a Low Resistance atomizer to emulate a 5 volt vaporizer.
- Because of the significantly increased battery output, vapor production increases much more, as does atomizer heat. Do not block the single vent hole on the atomizer or the atomizer will heat to the point of burning the user or ruining the unit.
Hope this helps.