An interesting little rechargeable keychain light that is often described as an olight, but probably isn't?

It's most notable for its simplicity, and the fact that it throws a load of extra LEDs into the mix with little extra cost other than the LEDs and a single resistor. In many ways the design is refreshingly simple, but then again, it is just a flashlight. So the magic will be in the firmware.

First test on the cell hints at a capacity of about 100mAh, which is typical for these small lights. The charge current is probably a bit aggressive for that size, but may be aimed at instant recharge gratification.

The use of an NPN bipolar transistor instead of a MOSFET for the main LED is odd. It reduces efficiency and also means that the lithium cell can be discharged lower than desired by continuing to draw current until the processor cuts off on low voltage. I wonder if the pin it's connected to has a dedicated LED driver mode (some processors do) or if it's just not capable of supplying as much current in a high state as it is in a low state.

If you search on eBay for keywords like rechargeable keychain flashlight you will find many vendors of these with a wide range of prices. Aim for around 6 of your local (£$€) currency units.

It's a useful little light, but I kinda prefer the flatter ones for use on a keyring that gets stuffed into a pocket. Then again, everyone has a different preference for their lights based on how they use them.

The light thankfully doesn't have the dire SOS mode - choosing to emulate the emergency services instead! It also doesn't have an LED saver that dims it back from the full intensity setting after it's been running for a while. But then again, it doesn't really hammer the LED too hard.

Reassembly of the light is easier than disassembly, and it does appear to support the PCB at the USB socket end and with the round LED PCB at the front.


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