ESR MagSafe Battery Pack (HaloLock) - 5000mAh Magnetic Wireless Power Bank with USB-C Cable & Kickstand | Portable Charger for iPhone 15/14/13/12 Series | Perfect for Travel, Work & Outdoor Activities (Black)

Got one of these a number of months back as a portable battery for my iPhone 13 Pro. Used it rather heavily for a bit, but my enthusiasm has since cooled a bit with it for mostly one major reason: heat.One problem inherent with wireless charging is that it's generally inefficient. Charging solutions that use magnets for alignment (like this one) can improve efficiency a fair bit compared to non magnetic wireless chargers, but you're always going to have a portion of the energy lost in the form of heat. This has two primary side effects: it can make the phone and battery uncomfortable to handle, and it can reduce the life of both batteries through thermal damage.Now, Apple isn't a dumb company. It does have some software mitigations to help their phones run as best they can, usually by slowing charging speed after the phone heats up past a certain point (both with wired and wireless charging). Problem is, on multiple occasions I've found my phone begins reporting itself as overheating while charging with this, which isn't good. This manifests as the flashlight being disabled to keep temperature in check as well as the phone's performance being throttled to reduce heat output. Longer term, it can also have an impact on your battery health, and I think as a result of my heavy use of this battery, my battery health is a fair bit worse than it'd be if I had charged via a cable. This isn't just a phone problem; this also affects the battery itself. I try to keep the wireless charging use to a minimum as a response.Now, beyond this, the charger is alright. It's perhaps a bit bulkier than I originally thought it'd be, which can complicate stuffing it in a pocket, but I've grown used to it. The kickstand is a nice feature, but it's rather thin, which means that it can fall over if you don't stand it up just right. Wish it was either thicker or full frame like comparable products from competitors.I guess my verdict is this: it works for what it is, but you may want to stick with using a cable for the sake of battery health.