Torch and 8 Batteries Puzzle || Think outside the box

You have a torch that requires 2 batteries to light up. You also have 8 batteries out of which only 4 are charged and remaining 4 are not charged.
But you don't know which 4 batteries are charged.
However you can try different combinations of batteries to light up the torch.
PUZZLE : What is the least number of attempts you need to make, to ensure that it will light up the torch.
The video has the best explanation for the Puzzle solution.
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