Isn't it incredible how much battery technology has advanced. This power bank claims to be rated 9 million mAh and yet it fits in your hand. Eat your heart out Elon. I'd like to correct one of the computations I made on the Kink Palculator. I was a mere three decimal places off, so I regret that a full charge of this power bank will only power your Tesla car for part of a day and not a year. But you can probably fit quite a lot of them in the glove compartment for long trips. It's also apparently twice the capacity of a Tesla Power Wall, but with the advantage of fitting conveniently in your pocket so you can charge it at Starbucks and steal all their power. In reality this is just the evolution of rival Chinese sellers on eBay trying to beat each others inflated figures. Their justification is that you might achieve this total capacity with all the recharges over the life of the product. (You won't.) It's worth adding another warning here. Even if these units do have solar panels, do NOT leave them in direct sunlight as it may overheat them and cause the lithium cell to fail dramatically. Aside from not actually being a 9 million mAh power pack, there was an element of disappointment to find that the real cell size could have been at least twice as big. The lithium cell test came in at just over 9,000,000 mAh at 9,000,005 which is pretty good... No not really. 1st cell charge cycle = 2358mAh 2nd cell charge cycle = 2410mAh The chunk of steel that adds reassuring weight to the unit is 70g (2.5oz). I specifically avoid using intrusive mid-run video adverts for a more relaxing viewing experience. If you enjoy these videos you can help support the channel with a dollar or two for coffee, cookies and random gadgets for disassembly at:- https://www.patreon.com/bigclive Patreon supporters get early access to advert-free videos as they are made, and also regular live streams. The Patreon support keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty. Other contribution options are available at:- http://www.bigclive.com/coffee.htm #ElectronicsCreators ... https://www.youtube.com/watch?v=duuws2g57Yc

Having quite liked the previous version of this I did a video of, I got a couple more from different suppliers for comparison. One of them (the black one) is similar, but has a different PCB and protection circuitry on its cell. The other, which is white and quite boxy has absolutely no charge protection of the cell at all, with the possibility that it can be charged up to well above 4.2V. (Theoretically all the way to 5V if the lithium cell can get that far.) This is a link to the black version that seems to have two layers of charge protection:- http://www.ebay.co.uk/itm/111792279982 And here's a link to the very dubious white one that appears to have no lithium cell overcharge protection at all! Note that this light may pose a genuine hazard! In fact as an extra safeguard against anyone accidentally selecting this link thinking it's a good one, I've deliberately butchered it with an X in the middle of the item number that will need to be removed to make a valid link. http://www.ebay.co.uk/itm/231732X413703 ... https://www.youtube.com/watch?v=RmGBbmauVfg

When I was a kid at school (that was quite a long time ago) I found a book in the library called "The Boy Electrician" which I pretty much had out continuously from the school library from that point onwards. It had loads of really dodgy projects in it like DIY X-ray machines and various other high voltage devices. One of the devices was a spark coil and a Jacob's ladder effect. I duly got myself a used neon sign transformer and improvised a Jacob's ladder on top of a chest of drawers with tape and wire. Fast forward a few years when I had finished my electrical apprenticeship and had money to buy better toys, I bought the biggest neon transformer I could find in Glasgow. A FART (yeah) 10kV 50mA unit. I built a new Jacobs ladder with proper hardware and was not happy with the critical nature of the gap at the base. I reasoned that introducing a third central electrode with current limiting could improve the initial arc distance by ionising the air with a thin trigger spark. It worked a treat, and since the original effect had a biblically themed name I added a new one for the electrode by calling it a Gabriel electrode (After the "arc" angel Gabriel). My Jacobs ladder was used on various TV productions in Scottish studios. I left the BBC test sticker on it because it's quite amusing that something like a Jacob's ladder could even be tested for electrical safety. I bet they had a long discussion about that one. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty. ... https://www.youtube.com/watch?v=Uv-6YgbDoyI

This is the most integrated of these lamps I've seen yet. The radar detector is on the same PCB as the LEDs and works very well. It's worth mentioning that these lamps put out a very low level radio signal that is not in any way harmful despite being described as "microwave" energy. That merely relates to the frequency being used. These lamps still creep me out slightly due to their ability to detect reflected radio signals round corners or through walls. This could result in false triggering in some instances. A primary advantage over the PIR versions is that these could be put inside a light fitting and still be able to see through it to detect movement. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm ... https://www.youtube.com/watch?v=2xHhLbhbb0k