If I had a NOCO charger I'd be tempted to open it up and compare it to my Chinese brand, wouldn't be at all surprised if both are very similar, possibly identical . This is what happens when there is a rush to off shore mfg and certain countries have a well documented history of not abiding by patent laws. When I was looking at buying a modern battery charger there were dozens of options to choose from but nearly all mfg in China.My NOCO 5 does have a separate repair mode function. I too as skeptical and maybe what they refer to as detecting sulfation is indeed checking resistance and just applying the right charge current. If I get a chance this weekend I'll put it back on and watch the voltage as it charges and see what happens when it gets to fully charged.