# GMG doubled its battery energy density. The hard part is still unsolved.

- slug: gmg-doubled-its-battery-energy-density-the-hard-part-is-still-unsolved
- date: 2026-04-15
- category: Space & Aerospace

The 49 Wh/kg figure at six-minute charge is real — but a phone battery stores four times more energy per kilogram. GMG is not targeting your phone. It is targeting the heavy equipment market where a six-minute pit stop beats a one-hour charge and downtime is the enemy.

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