Questions about Coast Zithion-X USB-C

Yes, I use the batteries for Godox TT350 and Canon Speedlite 430 EX flash.

Unfortunately, there is no information available and therefore we cannot answer this question.

as far as I know, charging is only possible via usb-c and not via a charger

My experience over the last six months is as follows: In direct comparison to standard AA/AAA alkaline batteries, these last approx. 1/3 with the same use in the same devices (cat flap and remote control). Instead of replacing alkaline batteries every 3 to 4 months, I now change the rechargeable batteries every 1...1.5 months. The end announces itself very spontaneously, from one day to the next, the voltage regulation of the rechargeable batteries is no longer able to supply the output voltage and stops working. Conclusion: these batteries can be used with devices where the battery change is easy to manage and spontaneous failure is not an issue. Otherwise they are rather cumbersome. The advantage is that they are quick and easy to recharge.

with 5V, 190mA, 950mW

The batteries can be charged with a standard charger as long as it has a USB-C interface. The batteries have an integrated USB-C port that allows them to be charged with a USB-C cable. However, it is not mandatory to use the specific USB-C cable included in the scope of delivery; any USB-C cable can be used.

If it's really only 2% of your devices that properly require 1.5V for things like the battery indicator and device behaviour to work as expected, then Eneloop might be the better choice despite less versatility. Especially when you combine multiple batteries, the voltage difference increases and in some cases leads to unexpected behaviour. For many professionals, it is the predictability of the discharge curve of Coast batteries that provides a better user experience and less downtime or even critical failures. In addition, the classic white Eneloop has a 20% lower capacity AA battery than the Coast ZX AA.

No, you can't do that. It's in the operating instructions. But I received a few defective ones. I returned them and a replacement arrived. One of them is defective again, but the answer is still pending. But the function is great. Completely converted as the operating voltage is 1.5 volts instead of 1.2 volts with conventional batteries. Will certainly be the future.

No, you charge the batteries with the supplied 4x USB-C "cable whip" on a charger.

It's not just that the capacity of Coast batteries is higher. They also have the patented Optimised Voltage Technology that mimics alkaline discharge curves, which means you can replace them in any device where you use alkaline batteries, and you can use the battery indicator in any device as with normal batteries. This makes a big difference in ease of use. Check out the reviews from other users, especially on this last function.