I found this on Krisbow (brand) rechargeable 4 slot charger MICRO USB.
Powered with 5V Microusb, could charge 4 AA batteries or 4AAA batteries.

But I wonder does this charger is smart chargers or dumb charger forcing to charge without cutoff?

Because I don't see NTC sensors and they don't provide manuals in the packaging.

Only lists this :
Output : AA 1.2V/1000mA
AAA 1.2V/100mA

More details on the pcb:

 

Couldn't find anything.

Easier to read picture:

 

LTC3406 and LM3406 are adjustable buck voltage regulator ICs. Perhaps the mystery IC is too.

 

The 34063 is an inverting regulator. Originally designed by Motorola, it is now sourced by Onsemi. It is an old design

https://www.onsemi.com/pdf/datasheet/mc34063a-d.pdf

 

The 34063 is an inverting regulator. Originally designed by Motorola, it is now sourced by Onsemi. It is an old design

https://www.onsemi.com/pdf/datasheet/mc34063a-d.pdf

Actually it's a repackaged 78S40 - I think it was introduced as uA78S40 by Fairchild.

If the mystery ICs is a switched-mode regulator, then there would be an inductor in the vicinity.
In the photo there is a diode on pin 2, and current sense resistors connected to pins 1,7 and 8 which correspond to figure 11 in the datasheet.

 

Actually it's a repackaged 78S40 - I think it was introduced as uA78S40 by Fairchild.

If the mystery ICs is a switched-mode regulator, then there would be an inductor in the vicinity.
In the photo there is a diode on pin 2, and current sense resistors connected to pins 1,7 and 8 which correspond to figure 11 in the datasheet.

Is it possible the last digit is a "9" instead of a "3"? That would make it a 34069 perhaps.

 

Is it possible the last digit is a "9"

I think it's an S. The character height seems slightly greater than that of the preceding characters.

 

Hi,
Attempting to 'process' the image, I would agree it looks like an 'S'

E

 

That's enough ambiguity for two lifetimes -- sheesh!

 

The components fit with its being a MC34063

 

The components fit with its being a MC34063

..And the inductor; present or not?

 

..And the inductor; present or not?

Still waiting for the TS to send a bigger picture.

 

..And the inductor; present or not?

There's one on the front side of the board.

 

EDIT: Sorry about the double post. The software threw an error message!

You should be able to delete your redundant post.

With the blue interface:

 

Last digit looks like a 9 to me.
Good luck/look...............

 

You should be able to delete your redundant post.

With the blue interface:
View attachment 301381

I tried that at the time and it failed, sadly!