TrustFire Mini 2 total teardown - with mystery component

I wasn't expecting this tiny rechargeable light to have FOUR circuit boards. It was extremely destructive to get apart due to the way it's manufactured. The circuit boards are :- Charging PCB. Contact and clamping PCB. LED control PCB. And the LED PCB itself. The way the charging PCB is locked in place with perfect alignment of the charging port is very clever. It's a micro USB port - probably to save space. The lithium cell is a standard 10180 size (10mm diameter by 18mm long) 80mAh cell. The LED control mechanism for turning the light on and choosing intensity is also very clever. But there's a mystery component, and I can't work out what it is. Initially I thought the component was a simple fixed current linear regulator, or maybe even a 3.3V voltage regulator to give stable intensity over a reasonable voltage range. But a test with variable voltage from a power supply showed no voltage or current regulation. I also thought it might be a polarity protection component in case the cell was inserted incorrectly and the power PCB actually allowed current to flow. But a reverse polarity test with a resistor in series just seemed to show a shunting effect. Then I thought it might be a timer to lower the current after a fixed duration, but testing at 250mA showed no change after an hour (maybe it is, but only shows at higher current.) The component code (SSCSG) gives no clues, but it has two decoupling capacitors on either side, suggesting it does do something. The flashlight would work without the chip or capacitors. At full intensity the battery voltage and LED current would drop quite quickly anyway, as it only has a marked capacity of 80mAh and on the bench supply at 4.2V the current was 800mA! I spent most of the reverse engineering time trying to identify the component or its function. This was another purchase via AliExpress (not a sponsor):- https://www.aliexpress.com/item/1005005192596687.html If you enjoy my videos, you can help support the channel with a dollar or two for coffee, cookies and gadgets, and keep it independent from the quirks of the YouTube algorithm by supporting me on Patreon. This also lets me link to my content on other platforms if YouTube uses the ban-hammer (again!) I release content for critique and feedback on Patreon as soon as it has been made. https://www.patreon.com/bigclive Alternatively, for a single contribution you can use PayPal:- https://www.paypal.com/paypalme/bigclive #ElectronicsCreators