How to fix high charge voltage in Liitokala Lii-100 and how to make lower charge currents

Thanks. Very useful.

Thanks.
Maybe I’ll need it when my 2 Lii-100 arrive.

Anywhere I can get some of these resistors cheaply?

thanks!

Added a link in the OP.

Thanks for the info.

Thanks!

What chips have you identified?
Could you post pictures of the circuit board?

I don't see any 6.2M listed in the link provided.

  • 10 units each of 1M, 1.5M, 2M, 2.2M, 4.7M, 10M, 1.2M, 3.3M, 5.1M, 3M

In case anyone needs it, Lii-100 is on the left. Teardown.

explain V-form?

It means he wired the two smaller resistors in series, then the set in parallel with the existing r5 resistor. The 3 resistors would physically form a triangle. If you stack the single larger resistor as recommended, you won’t need to bother with this.

KuoH

OH. I see. Then you could also solder 1.5M, + 4.7M,= 6.2M in series, then solder it in paralell to R5.

Is the 4.25V figure in the OP the voltage of a cell after it has been charged or is it the voltage of the charger taken while the charger is empty while plugged and measured the the + and - ends?

The measured values around 4.25V is the end voltages during charging. I have a piece of alu foil in each end of the battery and a Fluke 179 voltmeter with MINMAX function enabled connected to the foils. It stores the max voltage on the display.

May I know the voltages taken from the cell/s that was charged AFTER it was taken from the charger? (not DURING charging)

The main IC is a 14 pin unknown circuit (there are no markings on it). There is a separate 6 pin booster to make 5V marked AL579 but I have not yet found it by Googling. There are 3 MosFets marked 2300, a 3 pin Voltage reference TL431, marked 431, and a lot of other components. Interresting is that the charging current comes from an extra switcher, not directly from the 5V input.

I don't have that information, that is up to the type and age of battery, especially the inner resistance. I use different batteries, old and newer. It is not the battery, but the charger I am evaluating.

4.25V for charging is quite normal, so other than standardizing end voltage and increase battery endurance per OP wish, other members with regular charging use might not need to do this procedure.

Just my viewpoint, this mod slows down charging a bit and leave you with less charge capacity (and of course in doing so increase battery lifespan).