SKYRC IMAX B6AC V2 Battery Charger - Genuine

[Shock]

Has anyone got an IMAX B6AC V2 charger from SKYRC? Genuine, not interested in clones as they are all different.

I probably spent a good afternoon looking for a reasonable charger before deciding on this one (that is like a weeks work for someone with no clue). Thought I would just point out a few initial observations here before anyone buys one.

No mains or DC power switch - really inconvenient, ripping out a mains cable is horrible
Charging current is out by approx 100mA
Main banana socket output voltage detection approx 0.7V out
Shipped with 1.13 firmware which apparently has no calibration and needs updating to 1.14
You also need a 6s balanced LiPo (Li-ion?) with >4V per cell to calibrate
Found possible bug charging a NiHM - voltage detection drops a part volt after a few seconds charging
I assume that all the balanced charging voltage detection is out as well

It makes a large difference on small cells. Charging a NiMH between 200-300mA when you are 30% out is ridiculous. Since I now know what to search for I've read many complaints about users damaging cells being unaware of these inaccuracies. Right now I've been slow charging to under 1.4V and then charging the last 600mAH or so capacity at about 0.25C so I can trigger the NiMH negative delta voltage detection with a little more current. Lets just say - confidence is still low at this point. The voltage and current is out all the time, it's very disconcerting.

Then I find out they used cheap low tolerance resistors on the sense and balance circuit (at least in the first version of the B6). I feel like I might have just saved a few hours messing around finding this out. I have a suspicion they are still cheaping out years later and making everyone fuck around updating firmware and calibrating when it's a cheap parts problem, lets see shall we. I mean this is so far out it must be unusable out of the box on some cell types, they wouldn't be charged properly at all.

But could you imagine going out and buying a 6s Lipo just so you can calibrate when it's the resistors? Thankfully I can mock up 6 cells with a lot of isolated power supply channels, but I might do it with NiMH packs (just need a few extra battery holders first). It makes sense though to not mess will calibration at all till I look inside. These aren't exactly cheap at $50 or so.

I'm interested if anyone has the newer B6AC V2 version, seen custom firmware or have observed the same or checked out their resistors. According to SKYRCs website the B6AC V2 is more accurate and stable than the older version. Am also interested in board revision numbers as well, I thought this was a mature product. It might be a little too mature (drift joke heheh), will check mine as well when I crack it open.