It works fine on blocks, but when I try to charge an item, nothing happens. Tested it with Ender IO things like The Ender sword with the basic upgrade to give it a battery.

Confirmed with a Flux Capacitor from Thermal expansion as well.

Works on the Lead Cell with no issues, just charges it REALLY slow.

Is it still existed in beta version?

There is indeed, no item charge manager for RF energy. I think we can add one.

Do the ender IO items run on IF energy? If not, it probably won't work.

They use RF, I think? I noticed on another issue that this was a known issue for a while now, when charging blocks was fixed, it broke charging items. And it works on RF blocks just fine.