Where to Watch Battery (2022)

Pugazh, a rookie cop earns an immediate disliking from his higher official Inspector Rathnam because of his brilliance in handling the case. Inspector Rathnam is killed by a masked man who shoves expired batteries into his mouth. A medical industrialist is also done away in the same way. Who is the murderer using the unusual method and why he is doing it and whether he gets caught or not?