There has definitely been a change to the refill cartridges despite all replies from ok vape stating otherwise. I always raved about your products and converted all my smoker friends to your products. They have however all converted back over time due to poor quality in the cartridges. I have refrained from leaving a review up until now and always emailed direct with any issues providing batch numbers and have always had the same response that they have had no other issues. On occasion I have been sent a few replacement cartridges but nothing in comparison to the ones that have been faulty. I prefer to buy online to gain loyalty points and benefit from the free gifts of batteries etc but find buying in bulk even less value for money due to half the cartridges being less full. I started on menthol ecig 6 years ago and used 1 cartridge per day sometimes 2 on a weekend whilst off work however I now buy at least 5 packs a week And definitely use them. I thought I could have been that I moved on to the more powerful battery and reverted back however this made no difference. It’s really not acceptable and to b honest the customer does not have a leg to stand on as it’s our word against yours. You know when ur cartridge is full as it pops when you take your first puff and that is very rare with these cartridges now a days. I don’t overcharge my batteries and I always replace once a month to ensure I’m not damaging my throat sucking on burnt out batteries and trying to maximise the quality of my cartridges. It would b good if customers could actually see if their cartridges are full upon purchase. I really liked these products and I’ve never had a cigarette in 6 years but I feel users are not getting what they are paying for and it seems it’s I’m not the only one.