The English word for "Flashlight" is "Torch". As well, prior to electricity or battery operated flashlights, any flaming illumination was called a "torch", referring to making a fire on the end of a long stick (as seen in movies and still used in some undeveloped areas).
Torch
Candles, torches etc
Many high class flashlights can be used in tanker, like surefire, imalent, etc.
Primary cells are designed to be used once and discarded. Secondary cells are, by definition, rechargeable batteries, and as such are the kind used in rechargeable torches (or flashlights, for you American types).
You call people living in Australia, Australians.
Australians call them "lifts", but the word "elevators" is not unknown.
Watermelon, Australians just have an accent.
i presume you mean do Australians call us poms? if so yes
KIDS
it is a veranda
We call them thongs, and yes, many Australians wear them.
If it is an outdoors "grill", it is probably what Australians call a Barbeque. With increasing frequency, it is sometime known by its brand name as a Webber.
Australians commonly call chickens "chooks" (rhyming with looks).