shinester
Senior Member
China's white trash
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Email: shiny@ausprep.org
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Post by shinester on Aug 8, 2016 4:45:52 GMT 10
Not exactly the same, though the same rules apply, the ratings are usually bogus, as per this one rated at 5000mAh and had 1600mAh capacity when tested. What's actually inside nobody knows, though weight is probably the best way to gauge it. [same with fake rechargeable too btw]. The best way to test it is with a tester and a really rough yet easy way to know is to calculate energy density/volume or weight for lithium Ion.
The weight* Net Weight: 195 - 205g Li Ion Energy density: 100–265 W·h/kg So, that's just a battery of that weight, aka pretending we have no case, having the BEST and most expensive Li Ion battery, the most we can squeeze out of that weight is 265W*.205g /3.7v = 14682mAh @ 3.7V. If they used top quality lit-ion then it might be accurate. [doubt it] I'd guess that it would be closer to 150W*150g /3.7v = 6081mAh much like the one in the video. It's also got a piddly solar charge. Is it good for a one or two charges of the phone, sure. Is it worth the price they're asking, hell no, look on ebay or aliexpress for something that'll be a little under $20 and know what you're going to get, something underrated.
Source - en.wikipedia.org/wiki/Lithium-ion_battery
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tomatoes
Senior Member
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Post by tomatoes on Jan 18, 2017 10:10:16 GMT 10
I know this is an old post but I thought I'd add to it for anyone doing a search for this info in future.
I have a portable power bank (is that what it's called) that lives in my handbag. I read heaps of reviews before buying it and have been very satisfied. It's a "Jackery", stores 12000 mAh, with ports for 5V 1A and 5V 2.1A, and cost a bit under $100 so wasn't cheap. I wanted it for a long weekend away without power but with a need for phones (a festival where I needed to be able to contact others in our group) and i don't think I even used up half the charge. It is good for tablets etc too. I charged it last about 6 months ago, and have had it in my bag ever since, just using it very occasionally (as I can usually recharge from the car) and it still has about 2/3 charge left - so it is holding its charge well.
I have another similar battery and between the two of them I reckon I could last a week without recharging them, even using them for a couple of phones and an occasional tablet charge or just a phone and a tablet, but what I would actually do is use one up then connect it to a foldable solar panel and have half a week before I need to use that battery.
I know they are expensive and really one would do, especially if you're only planning for yourself. You could keep it topped up with solar. Definitely enough for getting through a blackout for a few days without recharging the battery. If you're planning for the needs of a family with multiple devices two batteries can make it easier or get one good one like the Jackery and pick up a few cheapies from Kmart or big W as back up for that.
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Post by thereth on Jan 18, 2017 20:12:34 GMT 10
Just a quick side question. When using a fridge as a faraday cage, is there any benefit to having it plugged in and switched off so it utilises the houses earthing system? A normal gpo only switches off the active so the earth cable should still be connected to the house.
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shinester
Senior Member
China's white trash
Posts: 3,119
Likes: 3,578
Email: shiny@ausprep.org
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Post by shinester on Jan 18, 2017 21:10:56 GMT 10
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