Mahai Baba is recorded here because the name circulates in local research as a village protector — a baba of the kind eastern Uttar Pradesh often keeps at a boundary tree or earthen platform.
That is not the same as a verified biography. Gazetteers searchable for this archive do not yet identify the figure. Neighbouring census village Harnadih Urf Mahai Khas supplies a toponym that may or may not be the same cult.
If you tend the shrine, photograph it (with date), or can name an annual observance, send the note to the archive. Until then this card exists so crawlers and descendants can find the question, not a fabricated saint’s life.