HJK, isn’t 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 “4.20v”. Doesn’t 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.
I’m mostly curious why HJK didn’t 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 ‘failure’. That is off by something like 1%. Voltage will drop a bit after it sits awhile. Some people would love getting a ‘full charge’, and bitch if they don’t. 
That said I’m 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% That’s 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 haven’t found them it’s 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 adding….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.
Thanks flydiver. Reading the articles I understand that Lii-500S made an opinionated decision (while staying within the spec) to pump in max amp-hours assuming that average consumer will prefer more more capacity now instead of greater durability sometime in the future. I now understand their decision and it doesn’t bug me anymore. Having MC3000 as an alternative I have now a choice to make how do I want to treat my batteries.
I doubt a resistor will do the job though - it causes a voltage drop which will only make charger to believe that the battery is even less than the actual one. Probably a topic for eevblog.com 
Since the Lii-500s original power supply was categorized as unsafe, I replaced it with the Lii-500 power supply as suggested. Guess what? The power supply blew up, phoff…, its lid was shoot into the air.
What power supply do you guys suggest, fit for the Lii-500S charger?
Or is there a better budget charger to replace the 500S?
We’ll, the older brick is rated 12v 2A while the new one is 3A. No wonder it blew up.
I had a 50/50 luck with mine - the second one still works though I use it only occasionally.
Any 12v brick capable of 3A and above with DC barrel connector will do the job.
Unless buying a grade “A” unit, I’d go a couple of amps higher to be on the safe side.
If you have 40W or more USB-C brick or pwerbank, you can buy a smart usb-c->DC barrel converter that’s rated 12v. This method opens a plethora of opportunities.
I use such cable to power my ATEM Mini from a powerbank when on the go.
In the test, HKJ writes Testing the power supply with 2830 volt worked fine, but it failed 4242 volts between mains and low volt side, this makes it unsafe in 230V countries.
In what way is it dangerous? Is there a risk for the power supply to reach high temperatures ie above 70 degrees celcius? Or is it a risk to get electric shock touching it? Or is it more likely it will just blow up as the Lii-500 brick did?
I’m not sure how to interpret HJK analysis on the power brick. I wish he has provided more details about that for the uninitiated ppl like myself.
Most of the cheap bricks do not have over-current protection. I.e you USB wart won’t provide more than 2.5A of current even if you short-circuit it; however cheap DC power supplies in such situation will get overloaded, overhead and melt down.
Lii-500S is rated to consume up to 3A of current at 12V. Hence I’m saying that you can get, e.g. 5A capable 12v brick and it should hold just fine.