I had an idea for a Halloween scene that involves a barricade warning light.
Bunnings sells a Whites branded one for $10.50 that takes one or two 6V lantern batteries.
I got mine for $10 from a local 2nd hand / surplus shop.
It has 2 LEDs, recessed switched for on/off and steady/flashing modes.
It also has an LDR (Light Dependent Resistor) inside so that it turns off during daylight hours.
A metal bracket on the rear can be used to attach the light to a pole.
I had a 1200mAh 3.7V Li-Po cell laying about, so I simply soldered a mating
connector tail to the original battery pads. It seems to power the unit just fine.
The Li-Po will have to be removed for recharging of course.
The fully charged 1200mAh Li-Po cell powered the unit (flash mode) for approx
72 hours continuous operation. Towards the end the flash rate increased markedly.
At least it doesn’t look brand new now!