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Don't know what lights to get, I haven't got that far.Possibly. LEDs require anywhere from 1.2V to 3.6V (colour-dependent) so what LEDs are you using? If you can give a part number we can check the datasheets and see what the manufacturers say.
what does a joule thief do?You would most likely need some kind of boost converter to run them off a single AAA. Look up "Joule thief".
You can run them without a converter from a CR2032 coin cell, which is 3V.
Bob
Is it possible to stack 357/303 coin cell battery to do the job. I have limited space and a joule thief looks like it may not fit in the area availableA Joule thief boosts the voltage of a "run down and almost dead" single battery cell to dimly light a 3V LED.
I have many solar garden lights that use an AA or AAA rechargeable cell and a voltage boosting circuit.
An AAA alkaline cell averages 1.2V during a discharge and has a capacity of 800mAh for Energizer or 850mAh for Duracell. Then it can provide 1.2V x 825mAh= 1 Watt for 1 hour.
An LED is fairly bright with a current of 20mA. Three 3V LEDs need a power of 3 x 3V x 20mA= 0.18W but the voltage boosting circuit needs about 0.1W so the total is 0.28W. An AAA alkaline cell will power them for 1W/0.28W= 3.6 hours.