Last week I bought two brown LG 's for my Cuboid and start of getting suspicious. The pair only last a 6ml vape at 50watts. I did check the batteries but they looked alright. But I must admit the difference between my matt and gloss white is basically the same....lol. After getting my 213 with also brown LG 's I vaped about 12 ml at 50watts. Exact same tank and ceramic coil. So tonight I wanted to remove the batteries from the cuboid and I had one hell of a battle getting one out? I eventually took the ceramic tweezers to remove the stuck battery and then there were a spark, almost shit in my pants..lol. I try to inspect the battery but couldn't see anything strange. I recon there must be something seriously wrong with that battery, that is why the charge don't last. I couldn't find anything strange in the mod.