Fungal nail "laser" thing with puffed up lithium cell

I'm not sure how effective this device will actually be at killing nail fungus. There are professional machines that use light for treatment - often in conjunction with specialist dyes.

The instructions suggest using it twice a day for THREE MONTHS! That smacks of "getting out of warranty".

This unit uses four LEDs (not a laser as implied). Three blue and one infrared. All the blue LEDs are in parallel with a single resistor, and the IR LED is on its own with the same value of resistor, so given the IR LEDs lower forward voltage (about half of the blue) it will be running at massively higher power (250mA) than the blue ones.

The product came with a pre-failed lithium cell that is well puffed up. It's marked 400mAh. In its pre-failed state it yielded a consistent capacity of 224mAh. When a lithium cell puffs up it indicates that it is time to let it fully discharge and then recycle it safely.

The unit does have useful circuitry for switching a load with a countdown timer for a fixed (unadjustable) duration, plus a battery charge circuit. So it may be useful in other applications like an exposure timer or reminder.

If you want one to experiment with, then this unit came from AliExpress (not a sponsor). Here's a non-affiliate link to the item:-
https://www.aliexpress.com/item/1005010706942275.html
This will probably appear with a bundle deal option.




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