Liitokala Lii-600 overcharging batteries

Batteries and Chargers Chargers
1

Hi Guys,

I got a Lii-600, but I notice the battery voltage is about 4.219 after removing from charger.

Is there a way to adjust it to 4.2 ?

2

Hey welcome to the forum!

How are you measuring the voltage? 3 decimal places is quite precise, are you sure of the accuracy?

Although slightly below 4.2 would be better for cell longevity, the voltage you are seeing is about within tolerance.

1 Thank
3

Thanks, I measure it with AN8009 multimeter, which I compared with Fluke some time ago and it seems to be accurate. I started measuring, because all my Anduril lights indicate 4.22 after I got the Lii-600. With my old Xtar they always indicate 4.19.

It’s not such a big difference, however for cell longetivity I’m looking if someone fixed this by replacing resistor etc…

4

Have a pleasant time at this friendly forum, Shappy!

5

What would be considered too high? I had a charger that terminated over 4.25 and a flashlight with USB-C that terminated at 4.23. Both read with a multimeter.

6

Kind of rehtorical question: How accurate is your multimeter?

4.2V is maximum charging voltage is specified in most(?) cell technical documents.

I checked a copy of the Samsung 30Q document I found online, it only specified 4.20 for charging and simply “Protection function of the battery pack should be set within the specified
charge, discharge and temperature range in Cell Specification.”. I read this to mean anything above 4.20v is too much.

As to reasonable expections from budget electrical goods: I would suspect that electrical components used in most cheaper chargers usually have tolerances of 5%.

For me, I’d prefer 5% under for better cell longevity. 4.25V does seem a bit high; 4.23V (while on the charger) will probably settle down to 4.20v within a few hours of being removed from the charger.

2 Thanks
7

The acceptable end charging voltage is 4.20v +/- .05v.

Chris

1 Thank
8

I have the Lii 200 and it charges to 4.22v.

9

Thanks, so it’s normal.

10

There is a lot of myth with this subject. I’m sure that, from charging a battery at 4.15 volts, or 4.25 volts (overcharge), the difference is so minimal in battery life (how often do we use that battery? how often? how often do we charge it? etc., etc.), that by the time we want to check the REAL difference between 4.15 volts and 4.25 volts, we’ll all be dead…

Regards