Well my nitecore i2 lasted 2 days before the spring snapped off as if someone had taken a knife and cute it. The break was clean and I cannot understand how this happened. I went to put my battery in the slot and the spring just snapped. I thought it perhaps it just came loose so I took it apart to attach the spring and notice that the hook wasn't there. There was no saving this product. Now I have no battery charger. Called my local B&M vape shop and they said they have a nitecore um20. But the snapped spring has me worried that about spring loaded trays. The cost for the um20 is $25 and because of the desperate need for a charger, I really have no choice unless I want to wait a week for me to get one off ebay. I hope that my i2 was just a bad batch and not common for these battery chargers.