Ekachai was arrested last Friday after failing to report himself to the authorities following four summonses.
They had been issued as a result of the pro-election demonstration on March 24, which resulted in him facing several charges, from illegally using amplifiers to commit acts of sedition.
Ekachai is an active dissenter against the coup-installed regime.
Aside from the pro-election protest, he has also been vocal about the luxury-watch scandal that has embroiled the junta’s deputy leader, General Prawit Wongsuwan, who is also deputy prime minister and defence minister.