I have been around long enough to remember when lead-acid and NiCD were the only viable rechargeable technologies.

I've lived to see the introduction of NiMH, LiPo, and LiFEPo. It's always cool when a new tech is developed to a production level.

I personally am curious about the latest in battery development because energy storage technology is one of the biggest limitations in a number of areas. It doesn't all pan out but occasionally it does. So I see no sense in bitterly assuming nothing ever will.