A promising old battery technology with a fatal flaw gets a new lease of life thanks to a smart invention by Don Sadoway:
A new approach to rechargeable batteries | MIT News
Is isn't power dense but it is cheap and durable and therefore a likely candidate for grid storage.
The MIT link above is what you need to get a grasp of what's happening, but if you prefer a content free video:
It got me to search out the battery, so here goes 
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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