Rechargeable light bulbs?

My wife wants to get some additional lighting in our hallway without faffing around with an electrician. She's seen some wall-mounted lights that take these rechargeable bulbs:

Amazon.co.uk

And I have to say I'm weirded out by the idea. A standard fitting light bulb that is rechargeable surely means that it has say the bayonet fitting at the base but without the electrical contacts that a normal bulb would need? Or does it have those too and can recharge via USB or the electrical light fitting?

I'm also worried that I would be buying into a brief flash-in-the-pan technology. Does anyone here know much about these bulbs?

 

I used rechargeable bulbs during a recent power outage and they actually worked better than I expected. The only catch was with my chandeliers—some of the bulbs stayed dimly lit even when the switch was off, probably because of how the circuit works. Had to swap a couple out to avoid that faint glow at night, especially in the dining room where the chandeliers are more noticeable.