Battery tech really does move fast

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Image of an obviously fake palm-sized 9000000 milliamp-hour battery.

Just two years ago my car's 50 kWh battery weighed around 350 kg, now you can get a 45 kWh battery that fits in the palm of your hand!

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Someone buy this so they can tell me how big it is, and how long before it dies for good. Please.

Smaller than a credit card, didn't last opening the package