Li-Ion batteries were a massive technological step forward from NiMH cells but were not without faults of their own—like their tendency to explode. A new Lithium-Imide technology from Leyden Energy, however, send Lithium-Ion the way of NiMH.
It's a common problem—your shiny new laptop isn't looking so shiny or new anymore, and what's that? The battery barely holds a charge now? Ugh. I'm skeptical of Leyden Energy's claims, but would give their batteries a shot.