Other contributors have said "A flashlight battery is an example of?" is the same question as "What is a flashlight battery an example of?" If you believe that these are not asking the same thing and should be answered differently, click here
Clearly the bulb itself operates on electrical energy, but this is produced by the battery from chemical energy. I don't see any connection with thermal.
Solar flashlights use light from the sun to power themselves. So unless it is a lunar powered solar flashlight{ using light from the moon to power itself}, or it stores power it takes in from the...