So you guys own power banks? If you do whats their capacity?
I own two of 5200 mAh ones. They're convenient as fuck and can even be used to power all my projects too
not sure if i want to buy one or just buy another battery for my G3.
Well my Thinkpad with its 9-cell battery has an always-on USB port that acts like a power bank.
Does that count ?
>>51567290
my phone has a 5000mah battery and a reverse charging cable
>>51567290
>capacity
>"mAh"
Found the illiterate
>>51567335
*the ability of the battery to provide a constant current for a hour
>>51567378
>a hour
Found the illiterate
>>51567335
the fuck are you on about?
>>51567394
Fuck
*an hour
>>51567335
>milliamp-hour
that is a legitimate way of measuring capacity.
>>51567378
>a hour
Yup, found the retard
Have a Kmashi MP816 10,000 mAH battery bank I got for $7. Not bad, use it when out and about. Good for trips. Friends are always needing it. Want to pick up a huge capacity one if I can get it cheap with all these tech sales.
>>51567290
For one, they make pretty great gifts, not too expensive, but they look pricy and its something people will actually use instead of a retarded ass photo frame or something
I have one that takes AAs. Based Eneloop
have one, but don't really use it.
>>51567290
I have a 20000mAh Anker. I fucking love it. My EDC consists of my smartphone and a tablet bag containing an iPad, a Bluetooth speaker, a folding keyboard, and a gamepad, all of which charge over USB. It's a godsend in that context. I carry one Lightning cable and one micro-USB cable, and can charge almost anything.
Xiaomi 10400mah
Love it! Can charge my phone 3 time as fast a home power outlet.
>>51567290
I got a cheap 8 dollar one. It will last me a night at work. Then I charge it when I'm sleeping. I want to pick up another one. But lazy to.
I've got one labeled 10Ah but I doubt it is. Haven't cracked it open to check but it lasts quite a while, especially considering it lives in my car so it's always charged thanks to the solar panel it's got built in
Really though, I haven't actually plugged the thing in to charge since I bought it about 6 months ago
>>51568226
I too have a solar panel on my car's back, it has saved me quite a few times when the car battery ran out of juice and I was stranded in the middle of nowhere desert
>>51568296
I was talking about the battery bank having a solar panel, the battery bank hasn't been plugged in to be charged since the day I purchased it
But that's still sweet
>>51567290
A 10400mah one. Had for like 3 years love it. Bought ex a 16000mah like 7 months ago she loves that shit too but I use it for more stuff like powering pi's etc before I run power
>>51568457
How long does the 16k power the pi for?
why would you have a pair of battery packs? do you rotate them or something?
I have one of these. 20,000mAh, capable of charging tablets or whatever. It's nice insurance for not carrying a laptop charger around (and I don't want to use my laptop's battery to charge peripheral devices, since i use my laptop's battery to run the laptop)
>>51568505
whoops, this is the "these" i meant to post.
>>51568526
>>51568505
These are the best battery pack. Inexpensive, durable, relatively compact given the capacity.
>>51568540
Any will do
I bought a 10400 Chinese made no brand power pack and it works just fine
How different can a lithium ion battery with a charging IC be?
Anker 10000mAh
http://www.amazon.com/dp/B009USAJCC
Bought in a spate of "buy stuff!" consumer whorism to take advantage of Amazon Prime trial.
I often use it in tandem with with my HooToo TripMate Nano, though I think I would've been better served by the Tripmate Elite which would've covered both items' functions.
>>51568476
Anker 16k lasts a few days on idle.. I would not believe other brands
>>51568579
For starters, it can be lying about its capacity. Or the ports could be fragile. Or the casing could crack. Or it could be larger than it needs to be. Anything, really, you're pretty much taking their word for it when you buy from the chinks.
Got a 10k Xiaomi one as a gift.
>>51568595
So if I underclock the pi or use a pi zero, I could probably get a whole week on 16k
Man what an amazing time to be alive
>>51567290
> If you do whats their capacity?
5, 10, 16Ah - all Xiaomi.
Probably getting the 20Ah one at some point, too.
They are great and cost less than the batteries inside will cost in retail. No point in buying anything else.
>>51568595
> I would not believe other brands
Well, you're being silly then...
One 10kmah for my laptop (gives my xps 13 about +45%, can charge other devices as well)
One sony 7kmah for general use
One 700mah for BT devices.
>>51567335
Ampere hours are weird as fuck, but Farads are even weirder. Watt hours (or even joules, which is essentially a watt second) is best for measuring battery storage, and yes, it should be called energy instead of capacity.
>>51568909
>10kmah
Heh. kilo milli ... that's just Ah.
>>51568931
Can't just teach SI to someone who never studied physics.
>>51568931
Why are you so surprised?
>>51568923
True, but none of the devices are rated in that.
Also, most apart from the Xiaomi don't have a rating for 5V AND the native voltage their Lithium rechargeables run on, they usually just rate the lithium rechargeables only 'cause it looks better.
>>51568931
Sorry pham HS was 15 years ago and I skipped shop class for journalism class lel
>>51567290
Have nokia one with microusb, 1720mAh cost me just 5euros,
>>51568953
Well, it's fair to use 3.7V Li-ion chemistry Ampere*hour value, because the typical use for this device is to charge a phone that has a 3.7V lithium battery also. Less current goes through the wire, but given no loss (lol), that's how much phone battery will get on average.
>>51568939
These prefixes are also used on HDD storage and kitchen appliances (if you're not part of the handful of remaining "imperials" - metric measurements have them, eh) and everything, though.
>>51568952
Let's just call it a small correction and move on?
I just picked up a 16000mah Amazon basic for 16 dollars(I had a gift card) and the thing takes almost 8 hours to charge but will recharge my galaxy s5 12x plus depending if I'm playing on the phone while it's charging well worth the money
I have that power castle that can charge your USB devices and your laptop. I've found that its size of tips plus an Asus charger also make a good universal laptop charger.
>>51569001
When people learn by reading kitchen appliance labels, "kmah" happen.
>>51568980
The 10Ah Xiaomi costs ~$10-12 shipped. Just saying.
A 1720mAh is more like a single poor 18650 battery. Could do that with a Miller or something DiY style and get a 2.4Ah battery.
I have the anker 20kmah thing, bretty gud
>>51569024 (cont'd)
Pic is the miller charger / discharger (can use it like a battery pack with an unprotected 18650 of your choice, it will sit pretty firmly in that). And it has pretty minimal weight on its own.
That can get you anything up to about 4Ah, I think... best 18650 I have currently are ~3.4Ah Panasonics, though.
>>51569024
Maybe you have a point there.
>>51569037
never leave home without
>>51569007
I'm sorry it's 16,100mah
>>51569063
The Samsungs 18650's are killing the Panasonic's
>>51567444
Fuck I had one too, was seriously the shit for 10 bucks. Can't believe I left it on a plane
>>51569069
you charge your phone with a portable jumper?
>>51569093
Which ones?
>>51569154
Get a 10Ah Xiaomi for $10-12 shipped, should be a better replacement.
>>51569236
The Xiaomi one looks so cute I want to take a bite off it
>>51569233
no i use it to jumpstart my old civic. too poor to get the alternator fixed. kek
>>51569236
Sorry, the 25R's
>>51569249
The old & new 10Ah, 16Ah, old 5Ah look like a rounded box to me.
And the 5 and 20Ah variants just like a box, but they are good & cheap and the front panel is arguably aesthetic.
Don't buy from eBay or some crap like that, though. Get it from one of the many reputable chinese export stores, or highly rated aliexpress sellers who state it's original Xiaomi.
The pack is popular enough for externally next to perfect fakes to have appeared, but those imitations don't have batteries or charging/discharging electronics that are nearly as good.
>>51569311
WTF is it with xiaomi shit and having a hundred million knockoffs
>>51569307
Hm, I have 26H and F, but they're the economical batteries I use in my lights that store around 2.4Ah. And if I checked correctly, so do the 25R?
The Panasonics (NCR18650B) are better with their 3.2-3.4 Ah, no? (Also, actually the LG that are in muh Xiaomi battery packs are better, but I haven't removed any of these yet... just going by tests).
>>51569329
It is a big and very popular brand in China that got tons of awards and press.
[It is also big on the world scale, though not present everywhere they *are* number 3 maker of smartphones and stuff.]
And then fakes naturally happened, eh.
>>51569311
Oh, no. Guys I think we got a rectangle with rounded corners over here.
Can I plug a two-prong into one of these things?
>>51569591
No, they're strictly for USB. Incidentally, this is one of the best things about having an iPad as a daily driver instead of a laptop: it charges via USB.
>>51568579
batteries can provide inconsistent energy (or the USB ports might not conform to USB specs and potentially burn out your device).
Batteries and anything in general that provides energy are really problematic. Cheaping out on a battery (or a PSU, or a laptop charger) is pretty much universally considered ill-advised.
Don't just buy any old chink shit. at least see what their track record is.
>>51569591
You mean a household power plug, 110V - 250V something?
No, they're 5V USB battery packs, except the car one.
For 110V - 250V you'd need a really big and heavy array (solar installations and stuff in off-grid houses have them).
What IS feasible for such portable use is more like, a gasoline/diesel generator. Pic related.
Got to be careful with battery banks all it takes is 1 cheap chinese battery to explode in the night and burn your house down. And if you do have them, well dont keep them over anything flammable.
>>51569631
PS: Here are how how the solar off-grid household (or server room backup power or whatever) batteries might look.
You get a bunch of these and the other electronics required for charging / discharging them, and you can run 110V / 240V off them for a while. Not very portable, though.
>>51569669 (cont'd)
Also, actually if you want more lifespan out of these more long-lived LiFePO4 batteries, you'll be charging them to 70-80% of capacity or so only. They decay slower then, making them more economical. So ... the battery installation would be even heavier than on the spec sheet. Doesn't matter much in a house, but you won't be carrying these around.
With the Lithiums that are in consumer electronics battery packs & smartphones and stuff, you kinda just accept that it's the shorter-lived / higher power to weight - ratio lithium technology that will be more expensive over time, and roll with it. It will likely be time for a replacement in 4-7 years or so; shit happens, better than carrying twice the weight.
Can't match the generator for something with a reasonable weight and capacity (and even cost, with not very intensive use) anyways, if it still needs to be portable and household power.
>>51567331
Whats your phone anon? mine is huawei x1, also reverse charges.
My phone has a 7200 mAh Anker.
I have a shitty 4000mah battery pack, it's black in colour but recently it has started to go a green tinge, with a. Few weird specs of orange on it. Is the internal battery leaking?
>>51569804
Wow, never had that one before.
*Maybe* it's just some glue / solvent they used in the battery... but perhaps I'm being optimistic.
I'd replace it. Saving $10-12 on not getting a Xiaomi probably isn't worth damage to furniture or whatever that might cause if it fails in the wrong way (even just a bigger leak), and also you'll get a presumably *much* better battery.
>>51569862
>Xiaomi
I shall look into that, thanks. I'm from Australia too, would you happen to know where would be best to buy one from?
I think it is a leaking as I only get about 0-70% charge when I use the 4000mah power bank to charge my phone (1850mah battery) I assume some of the power would be lost in the transfer through heat and such, but surely a 4000mah would be able to give at least one full charge to my phone? because of this Im sorta assuming that one of the batteries has died.
And yes, its not worth burning my house down over.
>>51569631
Yeah, I wanted to have something I could just stick in my bag to feed my laptop as well.
>>51570308
X Y problem, faggot
They're more expensive ($60-70+) but they make ones for laptops too. Generally speaking though you're better off with a spare laptop battery (and charge the phone through its USB) because of the conversion losses.
10400mah
10400mah
12000mah
Guys be careful
Please do not leave your rechargeable batteries inside draws
A cheap shitty one I bought from a reliable legitimate phone store got hot enough to burn paper wedged up against it,
I'm not saying that all portable batteries are time-bombs, I'm just saying be careful with these fuckers
>>51567290
I have a Xiaomi 10400 mAh. Works fine, cheap as fuck.
>muh passthrough charging
>>51570090
>I shall look into that, thanks. I'm from Australia too, would you happen to know where would be best to buy one from?
I'm from Europe, but I think the shipping rates generally are flat rate to the west in China.
Check gearbest, banggood, geekbuying, merimobiles, 1949deal, ... and whoever else you find with these results.
Or highly rated aliexpress sellers that explicitly say the article is genuine Xiaomi. 10Ah bank should be around $10-12, about the same for the flatter 5Ah one, 20Ah goes for like $32-35 where I saw it (but that's maybe not the best deal possible).
> And yes, its not worth burning my house down over.
Not even worth cleaning up on a table or whatever, shit tends to be so annoying if a battery leaks.
>>51570308
Second laptop battery? They're also Lithium packs, but you don't want to transfer energy like 7.4V -> 240V -> 9V -> 7.4V or some shit like that. Surely 240V or whatever is how you get your household power in bulk, but then best just put it in the battery and done.
>>51570959
Thanks for the help!
I spent $20 AUD on my crappy 4000mah power bank, in store. I haven't ever really used alexpress before, but I found this:
http://www.aliexpress.com/item/original-xiaomi-power-bank-10400mAh-High-quality-xiaomi-10400-portable-xiaomi-powerbank-Charger-for-xiaomi-iphone/1671968791.html
looks good!
>>51571166
>buying chinese batteries
never ever
>>51571175
Im quite sure the crap one I bought from in store came from china. Where can I find non chinese batteries?
>>51571166
That might be the older 4 internal 18650 battery pack. Oddly it has higher value, presumably 'cause some people use the batteries separately or something.
The newer equal capacity 3 internal 18650 one should be like $12
http://www.banggood.com/Original-XIAOMI-5_1V-2_1A-10000mAh-Power-Bank-For-Smartphone-p-977406.html
http://www.gearbest.com/mobile-power-bank/pp_187685.html
Not that you should wallow in regret if you already ordered - the old one is fine, too.
>>51571175
> I don't know Xiaomi
http://www.hardwarezone.com.sg/review-xiaomis-10400mah-mi-power-bank-review-and-teardown-s14-crazy
http://www.hardwarezone.com.sg/review-xiaomi-16000mah-mi-power-bank-review-get-it-if-you-need-charge-2-devices-fast
http://www.gizmochina.com/2014/11/28/5000mah-xiaomi-mi-power-bank-tear/
And so on. Original ones are great, just don't buy the fakes (chances are very cheap ones that don't say original -especially sold on trade platforms- are imitations).
>>51567290
Xiaomi 16,000mAh (3.7V).
Extends the battery life of my Surface 3 to around 25 hours.
>>51571250
>http://www.hardwarezone.com.sg/review-xiaomi-16000mah-mi-power-bank-review-get-it-if-you-need-charge-2-devices-fast
Ill be buying this one
Thanks once again. You have been the most helpful person I've met on 4chan, holy shit its so cheap!
>>51571303
>>51571250
sorry for being retarded, but is it worth buying tracking? (extra $2.50) from banggood?
>>51571303
My pleasure.
Be aware that there *also* is an even newer 20Ah variant >>51568953 of the power bank that also has newer batteries (and thus more storage / weight), but that one costs $30-35 ish.
Not a linear increase in price from 10Ah ($10-12) to 20Ah ($30-35), so most people probably don't buy it for that reason. I didn't yet either, waiting for a price drop - it's also an export market problem, too expensive vs the Chinese original price.
>>51571324
Personally, I'm never paying extra for it.
The Chinese have lost almost nothing so far, our local postal services pretty much never loose anything, and trying to find a $10 package actually might not be even worth my time.
Mostly, it'd be the sellers that need tracking for proof on trade platforms (on eBay and even more on aliexpress, I can just go "not received" and they'll refund otherwise - not that I ever scammed anyone, but you kinda need that as a seller). Or for bigger items, because only tracked ones generally have insurance with postal services.
>>51567290
no because my battery isnt nigger shit and need charging 50 times a day
>>51571353
Thank you anon. I appreciate all the help! Have a good one
I own a 2200mAH one that I got for free at NYCC, haven't really used it.
![61a0882cbe7f106f003a2d023aa5b7b9_original[1].gif](https://i.imgur.com/L5TlNY3.gif "61a0882cbe7f106f003a2d023aa5b7b9_original[1].gif")
>>51571437
I also have a couple of those tube power banks, either given as promotional items, or bought for a few bucks.
Never get into trouble with battery life though, so I use them for powering USB fans or LEDs.
Pic related looks cool, but no way I'm paying $100 for a power bank with the same capacity as a $5 one.
>>51568296
Car chargers exist anon and they are about 3$
>>51569661
>>51571175
>idiots/shills spreading FUD
Just where do you think all the batteries (including "reputable" brands) are actually made?
Just be careful to get genuine Anker, Xaomii, etc. as the other anon pointed out. These are good quality, without being ripped off by OEMs.
What voltage is the mAh in power banks referring to?
The output voltage of 5V?
Or the internal cell voltage of 3.7V, or whatever?
>>51572359
there's a legitimate concern about third party brands. given the value of the devices you're plugging into these things - and the margin you're talking about trying to save money on one vs another - it just makes sense to buy Anker or some other well-established brand.
Note that I'm not discounting things made in China (that's insane, we'd be ruling out just about everything), but ruling out the absolutely no-name shit out there.
I hook up a 5500mah to my dashcam. Powers it for 4 hours with car off. Good for busy parking lots.
>>51572381
3.7V.
Xiaomi has the mAh rating listed for both 3.7V and 5V on the battery bank itself.
i got 2 10000mah, they are pretty large but i always walk around with a backpack anyway.
Phone in 3300mah so i can charge it a little uder 3 times on one powerbank
>>51572532
Well, unlike with household power adapters, the risk of power banks actually frying your device is low, due to how they and your smartphone work.
They can however quite possibly damage what they're sitting on when *they* themselves are charging, if there's a catastrophic failure.
Well, more typically than that, the shitty ones will have craptastic internal batteries that are like 1/3 the weight to energy ratio of the good stuff, low efficiency electronics (since you do 3.7V<->5V and all that, you can actually incur lots of head losses if they're poor) and fail early.
>>51568714
Sounds so. I've ran the pi A+ like 3 days with webserver running and doing stuff ssh /coding on it. Didn't really party attention to battery life but obviously it didn't die
>using a battery to charge a battery
Okay desu-senpai
Just ordered a 10000 mAh Xiaomi power bank for €11. For that price it's just a nice gadget to have, I don't even really need it.
This. Pebble explorer. 8400mAh. Two outputs. 1 1a. The other 2a.
Pretty good. Can charge my galaxy s4 3-4 times on a single charge.
>>51575520
I'm waiting for a high capacity power bank that has quick charge capabilities and doesn't cost a fortune
