@Ak89 Y'know, I have a feeling it is. Even though it's a real Nitecore CS4, which should be doing a great job of managing the batteries all the way to a full 4.2v...... maybe it's stopping a little early. Thinking about it a little more.... what if the Nitecore is charging to just below 4.2v, doing it's top up charge up to a 'safe' maximum. Then the 250C is reading them far more accurately than my 250 did. That would make sense I guess. Yes? No? 😉
EDIT: I have three HG2's charging now, one just flicked to full, 4.2v so I took it out straight away, I'm waiting for the other two now and I'll do the same, I'm wondering if it's discharging them slightly whilst waiting for the others to charge? Hmm.