Overview

• Megapack 3 increases per‑unit capacity to roughly 5 MWh and cuts thermal connections by 78% using larger 2.8‑liter LFP cells compared with the prior generation.
• Megablock integrates four Megapack 3 units with an on‑site megavolt transformer and switchgear to boost site density to 248 MWh per acre.
• Tesla says factory‑built integration enables installations 23% faster with up to 40% lower construction costs and allows commissioning of 1 GWh in 20 business days.
• The company lists a 25‑year life, more than 10,000 cycles and about 91% round‑trip efficiency at medium voltage with operation from −40°C to 60°C.
• Production is slated for Houston in late 2026 at around 50 GWh per year as major battery suppliers such as CATL and BYD promote competing utility‑scale systems.