The Maxell 24-power pack batteries come in a hard plastic case with a clip for opening and closing. I think it is the only company worldwide that offers this packaging for such a low price of batteries. Inside the sealed plastic case, the batteries are also sealed in groups of 6. I have tested them in devices such as a mini flashlight, remote control, watch, and mouse. They all worked flawlessly, and the average battery life in low-consumption electronic devices was 1 year. Their casing and contacts are made of very good materials. I measured their output voltage (out of the box) at 1.61V. I used a BF-2A battery holder device to measure the maximum output current of the batteries. At 1.51V, I measured a maximum output current of 0.3A. In this video, you can see all the tests, unboxing, and the first detailed presentation of the batteries: https://www.youtube.com/watch?v=EzTs3O4uDXU