Standard zinc-air cell vs mystery gas generating cell. (flame test)

I thought it would be a good idea to compare one of the mystery gas producing cells from an air freshener with a standard zinc-air hearing aid battery.

I bridged both with a 270 ohm resistor to give a controlled current flow, and sealed them inside syringes with some silicone grease on the plunger for an extra seal, then left them to do their thing.

A zinc-air battery is a type of cell that uses the oxygen in ambient air to facilitate an internal chemical reaction. They have some small holes in the cell case, and are supplied with a tab that covers them during storage to prevent the chemical process occuring. To use them you pull the tab off to expose them to air, and they then produce a voltage of about 1.3V.
They are commonly used in hearing aids because they have quite a high energy density and once activated tend to be used immediately.

In this weird application they are deliberately starved of the oxygen they need to generate current, and when a load is applied the smaller voltage they produce passes current through the load and they produce hydrogen gas at a rate determined by the current flow. This allows devices like grease dispensers and air-fresheners to use a simple resistor to set a gas generation speed with no external power required.

When I first discovered this approach in an automatic grease dispenser I mentioned it to AvE who was the inspiration to take the grease dispenser apart in the first place. He has done his own experiment linked here:-
https://www.youtube.com/watch?v=Ppm9b0JAQCQ

Here's a link to the video where I discovered these cells being used in an automatic lubricator:-
https://www.youtube.com/watch?v=Be9RU3PU1bw

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