MixBin Ready to Use, Disposable Battery Power Bank for Smartphones - Retail Packaging - Instant Power 3 Pack

The build material appears to be solid. The USB port connection is covered with removable plastic tab for one time use. The battery also contains an off-on switch to not inadvertently have the battery on. I have not recharged the phone, it appears that it will be quite serviceable. It has a five year shelflife and will be used for my bug out bag

This is the worst product, it actually killed my phone6, rip off,

I just received these and so happy that I have cell phone battery backup in case of any emergency. I live in earthquake country and last time we were without power for a couple days. This would have come in handy. I gave one to hubby, one to my car's glove compartment and keep one in my home. Battery lasts for 5 years from date printed. It is already charged and ready to go.