’s B Type-C crusader is back. Engineer son ung isn’t too keen on two of the newest flagship phones, the G5 HTC 10, because of how they incorporate Qualcomm’s Quick Charge instead of adhering to B-C’s charging stards.

As a engineer, ung has a ton of knowledge about power specs has put that to use by reviewing nearly every third-party B-C cable on Amazon. 

In essence, they don’t use the B-C charging spec, which forbids charging above five volts. Quick Charge, however, can charge at nine 12 volts for a faster charge. 

The issue isn’t out of left field. Our review of the HTC 10 noted the following:

The HTC 10 has got a B-C port, but doesn’t use regular B-C charging rates. That is, when attached to a power source like the Nexus 5X or 6chargers, it charges at normal speed, not rapidly. The phone instead incorporates Qualcomm’s Quick Charge 3.0 technology, includes such a charger in the box. I went from 0 to 50% charged in just half an hour, with a full 100% charge taking roughly 1.5 hours. 

ung says B-C specifications forbids Quick Charge from coexisting with the new stard. It doesn’t appear there’s any actual danger to your device, but it may be worth taking a look at if you want to ensure there’s no potential for long-term damage. And if you’re invested in B-C chargers for Nexus, Chromebook, or Macbook products, know they won’t charge those two phones quickly, just at the stard rate.

The impact on you: There’s no danger that you’re going to fry your device with any of these chargers. It just means that despite how nice reversible B-C is, there are still some stards to be ironed out. Maybe Samsung was on to something by sticking with micro-B for the Galaxy S7 S7 ge.