Generated a lot of heat when charging to my phoneFits perfectly on the back of my phone even when folded. Heats up quickly but I dont leave it attached longer than 30 min and it seems ok for traveling and charging. I wouldnt leave it in my bag connected to my phone though. It does get too hot for that.Really thought it was good at first. Would only add about 50% battery to my Galaxy S22 but it was a decent size and the magnet was good. The problem is it won't charge now. It has 2 way charging in the USB C which sounds good but if you cannot charge it then I'd rather just have the ability to charge it. Not good.Works well and not too bulky. I would use it as a way to juice up your phone when sitting idle. Not sure if I would use it if I was heavy use of the phone battery. But for a boost here and there I think it’s great. I would rather use a bigger battery or plug in if I was going to really be using phone a lot. But that’s why it’s small , just good enough to get your phone almost full charge if you are on empty.I purchased this for my new iPhone 13. It seemed like a great idea for a backup battery and initially worked well. Unfortunately, after a few charges it stopped recharging. I've tried to contact the seller through Amazon, but I've received no response. Find a different product, from a different seller.Great magnetic pull will test out charging ability.The charger was charging normally when I received it, but gradually started to decline in performance. The battery power drained rapidly and would heat up abnormally. I am disappointed to learn that the return window closed on July 23rd, 2022. I was expecting that Amazon will send me replacement. Now I have no option but to use it as a paper weight. SadGets crazy hot to the point it burned my leg in my pocket. Charges extremely slowly.