I bought about 7 of these batteries 3800 mAh & 4000 mAh. They worked pretty well. However, didn't even last a year. All of them have stopped working. Maybe got around 30-40 charges out of them. Wouldn't recommend these.
It’s pretty awesome really long lasting thanks guys
That extra 300 man makes a big difference I would not get this battery again
Works as it should, came half charged. What can I say it’s a battery
Works well, the battery is larger than my previous battery therefore fits the vape nicer and reduces the sound of any noise.