I own the hotcig sx300 35w version for few months now, for the simple reason of having a pocketable box mod/usb charging/replaceable 18650 and 20+w at an attractive price for my out and about mod.
I really do like sx boards for their real time battery displays. Got the sig20w when it 1st came out and loved it, although not a big fan of the gravity sensor to change wattage, it's not troubling to me as i don't change wattage much.
When I first got the sx300 35w I noticed some differences in board behaviour to my sig 20w(with authentic yihi sx200 board)
1. Display brightness - Dim on sx300 is brighter than sig20w, when bright on sx300 is dimmer than sig20w, in other words the difference between dim and bright on the sx300 is much less.
2. Waking up from sleep(display off) - sig20w wake up and fires instantly, while the sx300 lags a bit before the display lit up and fires.
3. Battery voltage reading - sig20w accurately matched readings from multimeter,full batt reads 4.16-4.17v. The sx300 is way off, reads like +0.2v on the same battery(4.36v ...!)
4. Battery sag(on display) - sig20w will sag to about 3.8-3.9v at 20w with a fully charged vtc4, sx300 will sag only to 4.1v at 20w with the same fully charged vtc4.
5. Some differences in menu - could be just different firmwares and board model
Power output measurements are good with a multimeter from 10w thru 35w, with 1.2ohm to 2.4ohm coil load, comparable to the sig20w.
So, I do have doubts that it's authentic yihi, but at the same time can't say conclusively whether clone or not until I rip the board out and visually inspect it and compare to a real yihi sx300 board.
From what I understand, the real yihi sx300 goes to 30w unless there are some upgrades that I dunno that take it to 35w and 50w. Yihi also states that they don't supply boards to 'other' chinese mod makers?
Many local sellers claimed it's authentic yihi, but at the price it's selling made me suspicious.
