There is now a huge choice of power supplies for your vaping needs. Batteries (Mods) are available with either fixed or replaceable battery cells inside.
Those with fixed internal batteries inside cannot be replaced and subsequently when they wear out you will need to replace the whole unit. Other options which enable you to change the internal battery (typically what we call an 18650 cell) gives you the freedom to replace it once it wears out.
All of the devices we sell have built in protection and for safety reasons we do not currently sell mechanical mods.
If you need any advice or have concerns on which battery to choose, please do not hesitate to get in touch with us.