Nitecore UM4 INTELLIGENT BATTERY CHARGER USB FOUR SLOT CHARGER

I've been using this for a very long time. Upgraded from the D4.
It's my go to workhorse for a stockpile of NiMh AAs and AAAs.
Generally it's reliable and I am happy with it but it's got a number of glitches:
*If you charge x3 NiMhs, the middle one will always finish twice as fast.
My understanding is, it allocates current in pairs, so an odd number of batteries may allocate double the current to the battery without a pair.
*Which brings into question the authenticity of the displayed current, which shows 500ma for every slot. Then again... the resistance does seem to consistently show half as much for the middle battery. Which could explain ...view more I've been using this for a very long time. Upgraded from the D4.
It's my go to workhorse for a stockpile of NiMh AAs and AAAs.
Generally it's reliable and I am happy with it but it's got a number of glitches:
*If you charge x3 NiMhs, the middle one will always finish twice as fast.
My understanding is, it allocates current in pairs, so an odd number of batteries may allocate double the current to the battery without a pair.
*Which brings into question the authenticity of the displayed current, which shows 500ma for every slot. Then again... the resistance does seem to consistently show half as much for the middle battery. Which could explain it?
*The resistance check itself seems like a very rough estimate. It is measured once when you insert the battery. The value is always different and can easily range between 80 to 180 for the same battery. Although when the values consistently get closer to 300 it's a fair guess the battery's ageing.
*Lastly, the QC charging appears to be completely redundant. I tested both standard and QC charging and there is absolutely no change to the charging currents. Even if you look at the official instructions manual, the comparison table shows no difference for all battery types between standard and QC chargers. So what's the point of QC?

This thing is a beast. Previously I had a dual charger and have 5 sets of batteries to charge. This would take all day.
Now I charge them in less than half the time. The readouts is comprehensive and shows battery health & charging status among other things.
I would definitely recommend this product! This thing is a beast. Previously I had a dual charger and have 5 sets of batteries to charge. This would take all day.
Now I charge them in less than half the time. The readouts is comprehensive and shows battery health & charging status among other things.
I would definitely recommend this product!

seemed to charge a couple of batteries I've tried thus far.
certainly appeals to those with a statistics charty things. seemed to charge a couple of batteries I've tried thus far.
certainly appeals to those with a statistics charty things.

Needed a new charger, debated between two of them, chose this one. I go through many 18650 batteries a day and being able to charge them all at once is a big bonus. The quick charge input feature with a compatible usb power source makes for fast charging of all cells, each cell has a readout of the time it's been charging, the mAh rating that has been delivered to the cell, the voltage of the cell and it's internal resistance. I might have to buy a second one of these. Needed a new charger, debated between two of them, chose this one. I go through many 18650 batteries a day and being able to charge them all at once is a big bonus. The quick charge input feature with a compatible usb power source makes for fast charging of all cells, each cell has a readout of the time it's been charging, the mAh rating that has been delivered to the cell, the voltage of the cell and it's internal resistance. I might have to buy a second one of these.