As it's name implies, was powered by the life energy of the Lightspeed Rangers.
Max Victory Robo BV was the only GoGoFive giant robo not to be destroyed or badly damaged during the final battle with Salamandes and Zylpheeza was never commandeered by Familiars Imps during the finale.
Lifeforce Megazord was commandeered along with the repaired Omega Megazord and used to attack the Lightspeed Aquabase, which resulted in the destruction of both, while the Omega Megazord was employed for a separate task.
Max Victory Robo BV intended to only appear in 1 episode.