Hello all, this is my first post, although I've been lurking for a while as my Google searches typically end up here.

I have an ISDT Q6 Nano charger which I have had no issues with. However, it has recently started struggling to balance charge all of the cells of my 6S lipos. If I charge a battery, cells 2-6 will charge normally to 4.2v, however, cell 1 will lag behind and at best only charge to 4.15v. I've even seen it where cell 1 ends up losing voltage, and the charging process never completes no matter how long I leave it. I recently got two brand new 6S lipos and on the first charge cell 1 only went to 4.15v whilst the others went to 4.2v. Last night I charged one up and cell 1 ended up at 4.09v and the others at 4.2v.

I've used a multimeter (albeit not calibrated probably as it was a cheap unit off Amazon) and the readings are pretty much the same as what the charger reads.

I'm using a ToolkitRC ADP100 power supply and no parralel charging board.

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I'm looking at either the ToolkitRC M7 or ToolkitRC M6D as a replacement. The M6D is twice the price, but I like the idea of being able to charge two lipos at a time. Any thoughts on these? I'm sure ISDT are a good brand, but I don't plan on buy another one of their chargers at this time.

Did you try and calibrate your charger: https://oscarliang.com/how-to-calibrate-...o-charger/

Each channel will need to be calibrated and best to calibrate with a 6s lipo connected. You will need a multimeter for this and does not have to be very accurate as long as the channels are consistently measured using the same multimeter.

You can also find a ton of videos walking you through this process.

Yeah I have calibrated it with a multimeter.

This is so frustrating though, as I've just bought two new 6s lipos and now both of them have cell 1 about 0.05-0.07v lower than the other 5 cells. Any chance a new charger could balance these out again?

If its one consistent channel thats not charging/balancing a cell then you could manually adjust the voltage by 0.05v more.

You may have a faulty charger and getting a new one will help but I would rather work on the charger you have to see if you can get the cells balanced.

I ended up buying a ToolkitRC M6D, and so far so good. It's managed to bring most of the cells back to a reasonably close voltage, which is also easier to tell because it reads to three decimal places instead of two.

I've also noticed that it's reading much lower resistance on each cell compared to the Q6 Nano, which was showing some batteries as having a ridiculously high resistance (even on a new battery, it was showing numbers that would probably make you ditch the battery).

Also loving having two channels.

This is an old topic. I am sorry for disturbing you. I can't decide between toolkitrc m7 and isdt q6 nano. This issue confused me even more. In which direction should I go ?