Thank you for the review. I have a Lii-500S, and it seems to be terminating charging of my Li-ion cells at 4.2 volts and otherwise working fine. Iāve also charged quite a few Eneloop and Fujistsu NiMH cells, which have not felt warm to the touch at termination of charging.
Iāve used this charger maybe 15 times in 230 volt with the original power adaptor. Can this have damaged the charger, in a way there could now be a weakness inside that may once escalate into something serious danger? And even if I now start to use the old Lii-500 power supply?
Donāt see why since the power supply is a universal one (100-240VAC 50/60Hz) and the charger itself only sees 12 volts.
Most likely not. The risk with a failed high voltage test is not the charger, but anyone touching the metal on the charger, but the high voltage test/requirement includes a lot of safety compare to normal domestic power. If you lives near some large factories or have a lot of lighting strikes in the area the risk is greater.
In 2020 I would say that this is not a good charger either for Lion or Nimh.
With so many good choices out there we have to start to be more critical of newer devices and this one based on HJK review should fall under the no buy category.
HJK work is important because most of us do not have equipment to see what the charger is actually doing.
In the end these chargers end up charging the batteries and they tell us what they charged but without the equipment we dont know if it handled the cells properly and/or actually charged the cells correctly.
Thanks for the review HKJ.
Very good work. 
I have this charger. Hhmm. But the good thing, i have another charger to use Xtar Sv2 Rocket
Is there anyone who can recommend a power supply for the Liitokala 500S charger with eu plug.
Thanks in advance.
Itās probably a āstandard sizeā plug, at least the one on the older Lii-500 is. Iāve found 3-5A/12v PS in local computer/electronics recycle stores for like $2-3. Work great. Many of my chargers are now powered by these āupgradesā.
Just take the charger with you to check for sure and glasses if you need them to read the fine print for output.
I agree with @hammerJoe. There would seem to be better chargers available. Itās not awful, but after reading HKJ review I wouldnāt buy it.
Thanks for the answer flydiver. 
I have your solution in my mind.
The solution for me was easier than I thought. Uses the Xtar power supply. The plug fits nicely and even if it only gives 2A it will work fine. I donāt charge the batteries so hard.
Excellent review as always, thanks for your hard work
@HKJ
Thanks for the review!
The display backlight turns off after 30 seconds but when you press one of the channel buttons for a few seconds it will stay on.
Perhaps you could add that to the list.
Thank You HKJ for that review. That was very deep/detailed, clear presentation.
I was going to buy this charger later this year.
But now I will get another Opus BT-C3100 2.2 instead. 
You mention that there are better alternatives - would you mind giving an example of other chargers that have the same functionality - can charge 21700 Li-ion, as well as NiMH and act as a power bank.
Vapcell S4 Plus
As well as ScyRC MC3000, XTAR Dragon VP4 Plus.
HJK, isnāt it a concern that Lii-500S charges batteries above 4.2v? I have two of those and the batteries get off them with 4.23v - 4.25v (tested by DMM) while Lii-500S still displays it as ā4.20vā. Doesnāt it damage the batteries in the long term if they are constantly charged above 4.2v?
from batteryuniversity.
Yeah, red that article in full already. There is a degradation but not before 200+ cycles. And with my usage, aging will take a heavier toll. Going to store them in fridge at +4C, at least the spare ones.
Iām mostly curious why HJK didnāt highlight it as a point of concern - they just state the fact that the voltage is a bit on a high side.
That is within charging spec, so not a āfailureā. That is off by something like 1%. Voltage will drop a bit after it sits awhile. Some people would love getting a āfull chargeā, and bitch if they donāt.
That said Iām one of those people that make some effort to keep the charge below 4.0v unless I need it immediately.
Opps - correction. Bad at fractions.
Well, 0.05/4.20 ~= 0.012 = 1.2% Thatās quite a lot in my book. Particularly considering that other at least nitecore and xtar charges stop at <4.21v.
Does anyone know any not-to-complex way to adjust it?
If you havenāt found them itās worth reading these articles:
https://lygte-info.dk/info/BatteryCharge4.2V%20UK.html
https://lygte-info.dk/info/batteryChargeTerminationTest%20UK.html
Note from one of the articles:
The LiIon charge specifications usual says that they must be charged to 4.20V +/-0.05V with termination at some specific current
Like I said, within spec.
Probably no simple way to fix it. I suspect it would require some fine soldering and addingā¦.something (resistor?).
If it really bugs you, replacement is one option of course. You could also just put the battery in discharge mode for a couple minutes after the charge. Slightly annoying, but free.