https://vapefiend.co.uk/herb-pod You can use these pods to put herb in, the ones mentioned above have no lid and are indeed for concentrates. My input on charging is that it's best to put the unit on charge after each session, now i have upgraded to the Sony battery VTC6, it just keeps the unit with full power, obviously that depends on how often and long you use it. I had an issue with removing the battery and using a battery charger, the threads on the unit are soft and after daily unscrewing it rendered the vape unusable, as the battery compartment would not stay screwed to the main heater. This was resolved by the vendor and i've kept taking the unit apart unless essential, it's all ok if care is taken. This has been a great unit, especially for the price, easily as good as more expensive vapes i have owned or tried. And like i've mentioned before, the ability to upgrade the battery, as progress in that field is made, it gives a new lease of life to something that was performing ok in the first place.