They work a treat, I brought one the other week. Very handy and cheaper than buying a battery and the charger.If you’re getting one of those and have only a few hives a car jump starter fits in your pocket and should do about six vapes. Much handier than a big battery
This is the one I have, Arteck K12 800mAh, 300A peak. Brought it off Amazon. It was about £36.99. The only downside is that it times out during the 2.5 min OA heating so I have to quickly restart it. Not a problem if you are doing a couple of hives, but could be if you have lots. It may well be a ‘feature’ that all models have as they are designed to give a quick surge of current to kick start a car rather than a constant flow.Where did you buy it please? Links?