Can I use Hewelth ReliefChain while it’s charging?

Mine works fine plugged in, no issues so far.

I’ve used mine while it was plugged in a few times, mostly because I forgot to charge it before sitting down. Nothing dramatic happened. It still ran through the modes the same way, heat included. The only thing I noticed is the cable gets in the way if you’re trying to move around, so it kind of defeats the hands-free thing. If I’m staying put on the couch it’s fine. I wouldn’t plan my whole routine around keeping it plugged in, but for an occasional top-up session it does the job. The bigger question is whether the battery even lasts long enough that you’d need to. Mine gets through a couple of sessions before it wants a charge, so plugging in mid-use isn’t something I do often. If yours is dying fast enough that you’re regularly using it tethered, that’s more of a battery thing than a safety thing in my book.

I just leave mine plugged in for most of the session and haven’t had any cutoffs or weirdness. The vibration and heat both stay steady, so I don’t see why you couldn’t. If it’s convenient, go for it.

The one thing I’d actually check is the heat side, not the charging. Mine gets noticeably warmer on the far infrared setting after about 20 minutes, and if it’s also plugged in I end up taking it off sooner than I would otherwise. Not because anything goes wrong, just that the warmth stacks up and it stops feeling relaxing. So if you’re doing a long session with heat on, the plug matters less than how long you leave it on. For pulse or vibration only I don’t notice any difference between plugged in or not. I still mostly charge mine between uses just out of habit, but that’s more about not tripping over the cord than anything the device does.

Mine actually died quicker plugged in, so I stopped.

I don’t buy the whole “never use it plugged in” thing. Mine’s been fine running off the cord plenty of times and nothing weird happened. If the manual doesn’t say don’t, I wouldn’t lose sleep over it.

Plugged mine in during a movie last weekend because it was flashing red. Worked the whole time, no shutoff, but there is one thing I noticed that might actually matter. When it is charging, the heat mode seems to cycle differently. Like it warms up then kind of backs off, warms up again. Not sure if that is intentional or just what happens when it is pulling power from the cord. Either way it was still usable, just felt less steady than when it runs off the battery alone. The manual for mine does not say anything about not using it while charging, so I figure if they wanted to warn people they would have put it in there. I still would not do it every single time just because I do not know what it does to the battery long term. But for an occasional session when you forgot to charge it, it works.

I mostly use mine plugged in when I’m at my desk since the battery always seems to run down at the worst time. It keeps working the whole time and I’ve never had it cut out on me. The cord is a little short though, so I end up sitting kind of close to the outlet.