A recent update on the ancient B3 AC,

I found someone selling a non-functioning B3AC, which i bought. my surprise the same 6 pin SMD part was burnt, and obvious enough, I transplant the chip from the bought Defunct unit to my previous Defunct B3AC, and it worked, but as i was warned some 6 years back by Satya Sir and others, it's a very inaccurate charger, after putting it to test, by charging a 1250mAh 3S pack.
After an 50 or so minutes, it lit all LEDS Green.

And the end voltages were 4.17, 4.19  4.21.

These numbers says enough.
My primary though was, it's never promised to be precise with balancing, and that Pack isn't New either.
So i discharged the pack in some following days, and charged with a Imax B6 running CHeali Firmware, the voltages after a 29 minute charge, were 4.19 4.19 4.20

So simply the charger is very sensitive to either voltage fluctuations or those tiny SMD aren't designed in that circuitry to last.

My small conclusion is, avoid it if you're in Hobby for long, thought for charging 2s of Toys, it's perfectly acceptable.