I have been using the C4 Air for some time, and recently I had the opportunity to use the C4 Evo. It is an exceptionally well-designed product—the pulse discharge, analysis features, and the increased charging power enabled through firmware updates are truly impressive improvements.
I believe that adding functions such as maintaining a specified voltage during charging, as well as discharging to match a designated voltage after charging, would further elevate the already excellent capabilities of the C4 Evo. These features are increasingly in demand among users today.
Such enhancements could be achieved by expanding the selectable voltage range for the current pulse discharge function, allowing adjustment from 1.10V to 1.45V.
Although subtle, this addition would make the C4 Evo even more valuable, as it aligns with the growing trend among users who not only seek high‑power charging but also want to maintain specific voltage ranges for extended use.

It has bad wire connection on USB, so it keeps rebooting or shuts down for good like it was not connected.
And also, it DOES NOT charge 4 AA ou 4 AAA batteries at the same time. It keeps reinitializing one channel, randomly. It does not care what charger you use, a 10W, or a 60W.

I have one and I can’t update and don’t working don’t charge the battery.

Good looking charger but as mentioned by other review it has an annoying high pitch sound. And I wish there was an option for charging 4x or more 18650 analyzing many batteries takes very long.

Did 18500 could it recharge with it ?