Rivian Automotive has turned a corner in its cost-cutting push. The electric-vehicle maker is repurposing more than 100 of its own second-life battery packs into a 10-megawatt-hour energy storage system at its Normal, Illinois, plant. Partner Redwood Materials handles the integration. This marks the largest such setup for any U.S. automaker. The April 14 announcement lands amid Rivian’s ramp-up for mass-market models. First-quarter production hit 10,236 vehicles. Deliveries reached 10,365. Those figures align with expectations. The company holds its 2026 guidance at 62,000 to 67,000 deliveries. Yet shares hover around $16.85, down 14.5% year to date. Goldman Sachs trimmed its price target to $17 from $19, keeping a neutral stance while eyeing the R2 launch and autonomy progress, as noted in a Yahoo Finance report. Second-life batteries retain over 50% capacity after vehicle duty. Rivian supplies the packs. Redwood’s Pack Manager technology weaves them into a unified Redwood Energy system.…