eBay rechargeable movement detecting light

This little light is cheap and trashy, but it works and has scope for improvement.
Easiest improvement would be to add a much bigger lithium cell, so it lasts longer between charges. There's a void of about 6mm under the PCB for the battery. A classic Nokia style cell does fit in the space.

This unit uses an unusual chip that seems to be dedicated to the function of a PIR light. It interfaces with a common PIR sensor and seems to deal with detecting signal fluctuations and timing without any external capacitors other than a basic filter. I've not managed to pin down the exact chip yet. The most notable oddity is the use of pins 2+ and 4- for power.

Searching on your local eBay for the following keyword string should find them:-
LED Motion Sensor Light Night PIR Battery Wireless Cabinet Stair Lamps Magnetic
Target price is around £$€5.

The chip has been identified as an mx8098g

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