Noco is fairly prominent brand in the lithium jump starter market, mainly due to heavy marketing. This unit failed after a few uses, so let's take a look inside and see if we can find what went wrong.

The optocouplerlike devices are indeed Cosmo 1010 optocouplers.
The battery balancing is dealt with by an 8254AA chip with 4435 MOSFETs.
The LEDs are driven by an Xn2115tp device.
The main processor is a Holtek HT46R06.
The USB output is powered by an MP1584 buck regulator.
The USB charging input is boosted up by an FP6293.
There's a GZ423 (maybe a dual op amp?) and a 3.3V regulator.

If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:
http://www.bigclive.com/coffee.htm