Vapcell S4+ in manual mode, will it 'dumb' charge aa/aaa/c nimh that are too low in voltage for some chargers?

Yep, it´s the VC4 I meant. It´s a very simple charger without any settings but my No.1 for low-voltage NiMH

You need to have a Power Supply for it with USB 5V/2,1A

Stay away from the VC4SL which is unusable as a NiMH-charger and it also show error with low-voltage NiMH

For it´s features the ISDT C4 EVO is cheap IMHO but due the small size, bugs and annoying fan not build for everyone, I use it atm very rarely

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right, i read that c4 evo experiences thread and it was very illuminating! O.o If the bugs were worked out, I bet it would be cool w/that replacement case that fits the Noctua fan.

Yep, but not sure how many work ISDT will do on it.

Looks like they´re more the guys for hobby chargers than for round cell chargers