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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Also try the following puzzles:
Can you solve the Tricky Puzzle || The Clever Commuter || Logical Puzzle
https://youtu.be/wX-L2ecNNGQ

Difficult Puzzle || 25 Horses Race || Asked in Google and Microsoft Interviews
https://youtu.be/pUj1Xia3FPw

Seemingly IMPOSSIBLE Fox Puzzle || Fox in a Hole || Asked in Google Interview
https://youtu.be/0Prp9n7XfP8

Parking Lot Puzzle || Can you solve this Math problem
https://youtu.be/J-oGv0Td4cI

Cheryl's Birthday Puzzle || Viral Puzzle on Facebook and Whatsapp
https://youtu.be/gFYYzWoydDA

Dark Room and Coins Puzzle || Can You Solve this Logic Puzzle
https://youtu.be/YRhbTJaFsE8

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