The incident occurred at Damarchala village of Miryalguda Mandal district on Friday, Aug 27.
According to police, the boy was tied to a pole and his 32-year-old mother allegedly thrashed him with a live electric wire resulting in his death.
A senior police officer said, K Shivamani was reportedly annoyed when her son opposed her alleged illicit affair.
The woman, on the other hand, refuted the allegation and claimed that her son harassed her daily. She said the boy was neither studying nor doing any work and was indulging in illegal acts, police said.
"Following a complaint by the villagers, police have registered a case of murder against Shivamani, who has been taken into custody," a senior police officer said.