Portable Energy Storage Market Size, Share & Industry Analysis, By Capacity (Below 300 Wh, 301 Wh – 500 Wh, 501 Wh – 1,000 Wh, 1,001 Wh – 2,000 Wh, and Above 2,000 Wh), By Battery Chemistry (Lithium Iron Phosphate (LFP), Lithium-ion (NMC), and Others), By Application (Emergency Backup Power, Residential Off-grid, RV & Overlanding, Outdoor Recreation & Camping, Construction & Field Operations, and Others), and Regional Forecast, 2026-2034