This 8400mAh one's pretty good for £24. The two USB ports can be handy.
http://www.amazon.co.uk/Upgraded-Ve...PRQ4/ref=sr_1_1?ie=UTF8&qid=1348228445&sr=8-1
So how many times can you charge your phone? This battery is 70% efficient (nothing is ever 100%). According to their website (ianker.com) use this formula.
Capacity of the External Battery * 70% / Capacity of the Mobile Phone
So for my phone, HTC One V (1500 mAh battery) - 10,000 / 70 * 100 / 1500 = 4.66, or 4 full charges from 0% to 100% & 1 more charge from 0% to 66%
In testing I achieved 4 full charges from 0% to 100%, & 1 more charge from 0% to 54% before the Astro 3 was totally flat.
It took 2 1/2 hours to fully charge my phone using the S USB slot. It took 3 hours to fully charge my phone using the I USB slot.
(Using the wall charger that came with my phone, it takes 1 1/2 hours to charge my phone from 0% to 100%)
2 USB slots can charge up to 2A (@5V). USB Slot I is for Apple devices, USB Slot S is for Samsung (read Android) devices. Both slots work for any USB device I have tried that is 5V.
This also has a DC out slot that is switchable between 9V & 12V.
Your device will only draw UP TO the Amps that it is designed for. In other words if your wall charger is 1A 5V, it is ok to use this external battery, your device will only draw 1A. The external battery itself can supply up to 2A depending on your device, just make sure its 5V.
I also tried charging my netbook, an EeePC (1000HE) made by Asus, with an 8400 mAh battery that lasts for around 7 hours. The wall charger for this is 12V 3A. I was a little dubious about this as they say this device is not compatible with Asus tablets.
Anyway after 1 hour of charging, my netbook went from 3% to 32% & had 2 hours 15 mins of time on it. The external battery had 2 LEDs lit up after this, so between 50% & 75% charge left (I suspect just over 50%). The external battery was also rather warm, presumably my netbook was trying to draw 3A. I wasnt willing to try anymore because I didnt want to damage my Astro 3, but it will be ok for an emergency.
£23.99 - Anker® Astro2 Dual USB Output 8400mAh = £0.00286 / mAh
Being as money is tight but I need one of these for work I think the Anker® Astro2 sneaks it. Great review on Amazon if you like a bit of tech reading and don't understand batteries that well:
editor said:That was meant to say 'torch' but I think I prefer Toronto.
ChrisD said:looks interesting. when reviewing please confirm weight without cables ? 340g boxed product.
The lead on mine broke so I complained (it wouldn't charge).Arrived today.
Just charging up and not weighed yet.
I like it though. Came with a snazzy mesh bag, the built in torch is good and it has a mirror on one side
Well packaged and has 18 month warranty
how many chargers have you got?Forgot to weigh it last night but will do later.
In other 'charging news' this is a pretty good deal at £4.99 for a Triple USB AC Charger Travel Pack with Multi Socket Adaptor.
how many chargers have you got?
and have three proved sufficient?
and have three proved sufficient?
Roll on the widespread adoption of wireless chargers is what I say.
Palm had an excellent wireless charger two years ago,. It's a brilliant feature.Isn't it less efficient then a cable? Not that it matters on the mains, but if you're using a portable?
But yes roll on the widespread adoption, although I hope they leave an old fashioned cable port. I think Apple will be the first do away with one of these.
I don't think they were that pricey. I've still got on here, in fact.Touchstone wasn't it? Seem to remember the chargers themselves were quite pricey, but may be wrong.
And pubs. And anywhere there's tables and people.Yeah it's coming. Will be able to stick our phones down on the table in coffee shops soon to top them up. Assuming you drink coffee in those kind of places of course.
And pubs. And anywhere there's tables and people.