I found these in Poundland.
The chunky ones are ‘N’ and are 1.5V. The two smaller ones are E23A and the little one at the top is A27. Those are 12V! Yes, they can run a garden train in N or OO scale! They fit easily inside most OO scale engines and would be easy to fit into a coach or wagon behind an N scale engine. They probably wouldn’t run a motor for very long (hey, at five for a pound you really wouldn’t expect them to) but long enough to revel in the insanity of doing it, I think. Plus, fitting a resistor to slow the train from full speed might help make them last a little bit longer.
I made a garden railway once, in the garden of a house I rented a long time ago. It’s probably still there since I didn’t skimp on the concrete base. It was a simple loop of OO scale track and the engine was an 0-4-0 powered by a 9V battery in the little coach behind it This was around a rockery so the foliage and scenery was all real. I’ve often thought of doing it again.
I have never heard of these battery sizes before. The weirdest ones I know of so far are the strange batteries in old Canon and Praktica SLR cameras. These new ones look very useful.
They are easy to hide in 1/24th scale, not too hard to hide in OO scale and possible to hide in N scale and they can deliver up to 12 volts! They can do more than just light an LED.
Garden railways will be on hold until the summer (aka ‘global warming’) arrives. This is good, I already have too many things on the go. All I can do for now is strap a battery to a motor and see how long it runs for.
Twelve volts. You could make real smoke with twelve volts…