I would imagine they are charged, maybe try them in something else to make sure.
Even if you there isn't enough juice in the batteries to heat the herb, there should be enough to get the LED in the LB to light up very dimly at least.
Basically you need to establish if the batteries are charged or not. If they are then it could be a fault with the LB, which is a pity but if that's the case you just need to get in touch with magic flight and they will arrange a replacement for you.
Even if you there isn't enough juice in the batteries to heat the herb, there should be enough to get the LED in the LB to light up very dimly at least.
Basically you need to establish if the batteries are charged or not. If they are then it could be a fault with the LB, which is a pity but if that's the case you just need to get in touch with magic flight and they will arrange a replacement for you.