The second uncommon feature of the Sigelei 213 is that it has both TCR (temperature coefficient of resistance) and TFR (temperature factor of resistance) modes. While the former is popping up in more and more devices, the latter is relatively uncommon.
According to a pair of engineers I spoke to, TFR potentially allows for a more accurate and consistent form of temperature control. As I’m generally a science idiot, I’ll take their words for it. My extremely crude understanding is that TFR works on a curve, while TCR works linearly. If you have a technical background and can help everyone understand the difference between the two, I’d love for you to leave a comment below.
On the battery side, the Sigelei 213 shows the output in amps. This is a feature I wish all regulated mods had. I like to think that it will help vapers stay safe by helping them stay within the safe limits of what their batteries are accurately rated for (in most cases, going past 20a is a no-no).
Under the hood, both batteries are monitored independently. The Sigelei 213 has built-in protection for out-of-balance batteries. If the battery levels become too imbalanced then the device will go into safety mode, protecting the batteries and –most importantly — the user."