Inside a LIDL rechargeable work light and power bank (with schematic)

Quite a useful work light, but with a few oddities - some of which are a bit squirmy.
Although the light indicated that it has fully charged with a set of green LEDs, the lithium cell kept charging up to 4.3V before cutting off and settling back to 4.25V which is coincidentally the cut-off voltage for a classic DW01A style cell protection circuit.
The power bank chip could have topped the cell off nicely at 4.2V if its voltage select pin had been connected to the 0V rail, which ironically passes right under the pin! Because they left it floating the chip cuts off at 4.35V instead, which is why the cell protection circuit kicked in.

Lithium cells don't like heat, which is unfortunate when this one is mounted right behind a very hot LED COB array. There are no resistors, so the LEDs are being pushed quite hard. That won't be helped by the higher peak cell voltage. The battery thermistor may be to protect against excessive cell temperature.

The construction is quite complex. I don't recommend taking one apart, as it's tricky to put back together again with things worthy of note being the route the wires take through the hinge, the vicinity of the wires to screw posts and the two longer screws that belong in the middle of the green bumpers. The wires also have to be pinned into the seals with a screwdriver while placing the COB arrays back into position, and there's a spring loaded position indexer that has to be put into place before the first hinge clam is put in place. There's just one of the indexers despite there being the facilities for two - so don't worry if you think one has pinged out somewhere.
The screws also felt like they had been inserted into the plastic pillars with a bit too much torque.

If I have to be brutally honest, I'd choose the Aldi worklight over the LIDL one. It has a simpler design and the facility to dim the LED array for cooler running.

If using this light for a long time I'd recommend using it with just one LED COB lit, specifically the one on the same section as the control buttons, as it is not next to the lithium cell.

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