[Q] External Battery
- Thread starter ks88
- Start date
Each of these options has pluses and minuses. The reviews at each of the links say as much. One of the batteries you linked to has retractable power "prongs" so the A/C adapter is built in, a great option. Another has a proprietary power cord and the third has no charge status indicators (minuses, IMO). All of them are a little heavier than others I've seen, but only by an ounce or so. They are certainly cheaper than brand name alternatives. I won't be the first to plug no-name power sources into my electronics but I appreciate the feedback from users who do.
Ah, I've went through those too. I've issues with their 5.5v output voltage. That means the phone/nook will have to dissipate that extra voltage as heat. At best, it'll heat it up more, worse, it'll be over the spec and burn something out overtime. I have no way for sure to know if that's the case, but I'm sticking with 5v output voltage. I love the extra capacity though.
i go on long trips that I might not have a wall plug in (bicycle touring). I have two of these bad boys:
http://www.epowerpad.com/model/PPD130.aspx
they power the nook color and all of my phones no problem. each battery has 2 usb ports to charge and one cable to charge my laptop. It's a lot of money, but I can charge my nook color 5 times over with one of these.
http://www.epowerpad.com/model/PPD130.aspx
they power the nook color and all of my phones no problem. each battery has 2 usb ports to charge and one cable to charge my laptop. It's a lot of money, but I can charge my nook color 5 times over with one of these.
Pricey but thanks for the link.
Do they "fast charge" your NC like the stock charger does?
Two more options just became available:
monster 6600mah
http://www.dealextreme.com/p/6600mah-rechargeable-external-battery-with-usb-cable-silver-black-59886
4000mah
http://www.dealextreme.com/p/4000mah-rechargeable-external-battery-with-usb-cable-white-59885
I JUST ordered the 2400mah this week... But some consolation, by a pure mah/dollar point of view, the 2400mah is the best:
2400mah 193.55mah/$1
4000mah 142.86mah/$1
6600mah 126.44mah/$1
monster 6600mah
http://www.dealextreme.com/p/6600mah-rechargeable-external-battery-with-usb-cable-silver-black-59886
4000mah
http://www.dealextreme.com/p/4000mah-rechargeable-external-battery-with-usb-cable-white-59885
I JUST ordered the 2400mah this week... But some consolation, by a pure mah/dollar point of view, the 2400mah is the best:
2400mah 193.55mah/$1
4000mah 142.86mah/$1
6600mah 126.44mah/$1
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And the 3000?Why u didnt check this option?
Anyway, we will wait for comments after U use it.
I explained in my previous post that I did not like the fact the 3000mah ouputs 5.5v. I compared the 3 that I am interested.
I picked up one of these a few years back for a trans-Atlantic flight to keep my iPhone, PSP, etc., alive as long as possible:
http://www.lenmar.com/Web/ProductDetails.aspx?ProductID=PPU2400B
It's worked quite well for me and seems to provide power to the Nook just fine by plugging its own USB cable into the battery.
I think I got it at Fry's for ~$25 at the time. I'm sure there are plenty of other options on the market now, but these general types of solutions seem to work great.
http://www.lenmar.com/Web/ProductDetails.aspx?ProductID=PPU2400B
It's worked quite well for me and seems to provide power to the Nook just fine by plugging its own USB cable into the battery.
I think I got it at Fry's for ~$25 at the time. I'm sure there are plenty of other options on the market now, but these general types of solutions seem to work great.
What about these 8000mah, though I can only imagine using them on long distance trips.
You can finally wear that sweater with the custom made pocket for Ipad but only to hold the charger
Maybe able to power the Nook one and a half charge or a few good charges on the cellphone. Charge to full is about 4hrs. There's a discontinued 30 pin female to female usb converter to enable dual charging.
cablejive.com/universal-dock-converter
Couldn't find any reviews, what're your thoughts?
cgi.ebay.ca/Battery-8000mAh-Pack-USB-Cable-iPad-Apple-/160590173094?pt=US_Tablet_Accessories&hash=item2563eb93a6
yeedong.com/buy-wholesale-Gadgets-Energizer-8000mAh-Universal-Battery-Pack-w-IPad-tip---XP8000+pid_5170+country_14+currency_14.aspx
qvc.com/qic/qvcapp.aspx/view.2/app.detail/params.item.E248547.desc.dreamGEAR-iPad-8000mAh-Portable-Power-Lithium-Battery?&cookie=set
You can finally wear that sweater with the custom made pocket for Ipad but only to hold the charger
Maybe able to power the Nook one and a half charge or a few good charges on the cellphone. Charge to full is about 4hrs. There's a discontinued 30 pin female to female usb converter to enable dual charging.
cablejive.com/universal-dock-converter
Couldn't find any reviews, what're your thoughts?
cgi.ebay.ca/Battery-8000mAh-Pack-USB-Cable-iPad-Apple-/160590173094?pt=US_Tablet_Accessories&hash=item2563eb93a6
yeedong.com/buy-wholesale-Gadgets-Energizer-8000mAh-Universal-Battery-Pack-w-IPad-tip---XP8000+pid_5170+country_14+currency_14.aspx
qvc.com/qic/qvcapp.aspx/view.2/app.detail/params.item.E248547.desc.dreamGEAR-iPad-8000mAh-Portable-Power-Lithium-Battery?&cookie=set
One of the things to keep in mind about the fast chargers is that they do something funky with the data pins to indicate that they're not a computer. USB devices have to ask permission from the host computer to increase their power draw above the default level, which I think might be 100 mA. They're also limited to a maximum of something like 500 mA. AC adapters do something funky, like short the two data pins together, or to ground, or something along those lines to indicate that they're not a computer and you can draw as much as you like without asking permission. If that's not implemented on the aftermarket charger then the USB device, like the nook, won't draw more than 100 mA so as to stay compliant with the USB spec.
I ordered the monoprice charger. Relatively small and light plus it works! I found the connection between the charger and my nook and phone were a bit of a pain to use while traveling. Therefor, I ordered the ebay cable.
On an overseas flight, I might just plug the charger in when I drop below 60%. This would slowly recharge the unit while I am using the nook. However, I am hoping that recent advances in battery life will force me to repurpose my nook battery backup charger to a battery backup phone charger.
I got my 2400mah charger. It worked with my Epic and Nook without causing touch screen issues. New lithium batteries need a few cycles for all the capacity to be realized, so I did about 5 or 6 50% discharges over the past week. So here's my test result:
At 25% batteries left in my Epic (1500mah lipo), it charges it to 100% taking 2.5 hrs. That makes it around 450ma charging current by my estimate, not counting efficiency. If I take 80% efficiency in the phone charging circuit, that makes it around 560ma charging current.
The charger has 3 leds which blinks in sequence according to capacity during charging. I'm assuming 3 led means full, 2 is at 66%, and 1 at 33%. Since you should NEVER discharge a lithium battery beyond 80% of their rated capacity, I stop discharging it soon after the last led started blinking. Which surprisingly made some interesting math. Assuming 2400mah is the true capacity of the battery in the charger:
2400mah x 80% (never discharge beyond 80%) x 80% (charger circuit efficiency) x 80% (phone charging circuit efficiency) = 1228.8mah.
which incidentally is very close to 1500mah x 75%(my phone stage of charge) =1125mah. Very close to the above! Of course all of the above are without a shred of proof, and it's backed up by flying monkeys and unicorns. But I do know this, the charger will charge my 1500mah Epic from 25% to full without damaging the cell in the charger.
There's my review.
Given your estimated "true" capacity of your 2400mah charger at 1229mah, does it make sense to use it as a charger for the NC? The NC has a 4000mah battery will having the charger make a significant difference? Of course the same question can be asked about my purchase of the monoprice 2800mah charger.
I am going to see what my battery life is after I upgrade to the new kernel. If it does not improve, I will consider this one (after finding out the weight). I think if you used the Nook charging cable you should get "standard" charging times.
http://www.monoprice.com/products/p...=10831&cs_id=1083110&p_id=8295&seq=1&format=2
I tested the 2400mah charger with my nook last week, and I can get about 25% of the nook charged when hitting the last led on the charger. It seems to charge faster than using a regular usb cable and a standard iphone 120v usb adapter.
I would say bring it on your travel as a supplement charger. You can use it to charge all your USB devices and use it in emergencies. A super capacity battery powered charger will need to be plugged into the wall sometime right?
I didnt see that somewhere.
So, how many hours more can you use nook with this battery?
Sent from Nook Color on Phiremod 6.3 @1.3Ghz
So, how many hours more can you use nook with this battery?
Sent from Nook Color on Phiremod 6.3 @1.3Ghz
This question -- how many more hours, is how I look at the value of external batteries. Sure, you might be stranded somewhere and have 2-3 hours or more to recharge your Nook with an external battery, but a much more important factor for me is how long I can extend the battery life of my Nook with an external battery. As I wrote in a similar thread some time ago, I bought an Energizer XP2000 for about $35 at an OfficeMax (they're widely available). 2000 mAh capacity, weighs about 2oz, comes with its own cord with six different ends for different devices. I plugged it into my fully-charged Nook at 10,000 ft flying out of Seattle, watched non-stop video at 70% brightness in Airplane Mode for nearly five hours to Baltimore and still had 58% battery left on my Nook (the Energizer was discharged).
Starting years ago with PDAs my strategy on trips was to use external batteries right from the start so when I got where I was going I didn't have a dead phone or PDA. If I have no other choices, at the end of a trip I want my external battery to be dead, not my internal.
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Yes the XP8000 would be better. Especially if your a long distance traveler. Portable charger and external battery is essentially the same thing.
here is a link to assist in selecting the right one for you.
http://www.energizerpowerpacks.com/us/downloads/ProductGuide2010.pdf1
I use this with my nook. I can't answer any questions related to workability with Android phones. That's not this forum.
While using this device to charge my nook, my nook is completely usable. It will charge my nook when the device is plugged into the wall. It will also charge my nook when it's not plugged into the wall (it is a battery, after all). In either situation, my nook is completely usable when connected to this.
I use this battery with my proprietary nook charging cable.1
The micro USB tip that comes with the Energizer works fine with the Nook. I don't know about "fast charge" vs. "slow charge" and all that but it definitely works. One SUBSTANTIAL advantage of the XP2000 over the larger capacity models (of the Energizer line) is that you can use any USB-to-mini USB cable, including the one that comes with it, and plug it into either a USB power plug adapter or a USB port on a computer to charge it. The XP4000, XP8000 and XP18000 all require their own power adapter. It's included in the purchase of course but I don't like carrying around another cord. Not a deal-breaker, just a factor.11
Just a heads-up. When I searched this manufacturer and model number on Amazon the product that came up, a small device external charger, had the worst reviews I've ever seen on Amazon. Ten reviews, all from different people, over a 2 1/2 year period, every one a one-star (lowest) rating with damning commentary. Maybe I found the wrong product, maybe the reviewers are wrong, but FYI.
