How long will the charger hold its own charge if unused for a month or so? Anker® Astro3 10000mAh Dual 2A USB Output External Battery Backup for all iPhone, iPod, iPad; Most Android Phones: Samsung Galaxy S3 / HTC One X One S Sensation EVO / Motorola Droid / LG Optimus / Nokia N9 Lumia; Cameras: GoPro - [Charge Tablets, Digita...] How long will the charger hold its own charge if unused for a month or so? Anker® Astro3 10000mAh Dual 2A USB Output External Battery Backup for all iPhone, iPod, iPad; Most Android Phones:... » Read More How long will the charger hold its own charge if unused for a month or so? Anker® Astro3 10000mAh Dual 2A USB Output External Battery Backup for all iPhone, iPod, iPad; Most Android Phones: Samsung Galaxy S3 / HTC One X One S Sensation EVO / Motorola Droid / LG Optimus / Nokia N9 Lumia; Cameras: GoPro - [Charge Tablets, Digita...] « Show Less
1811509
Hi Burnett,Anker Astro3 will hold its own charge for about 6 months if you do not use it.
403359
Since this is a huge battery with 22400 milliamp-hours (22.4 amp hours) you will need to charge it for at least 22.4 hours at a current rate of one amp (or 11.2 hours at 2 amps). Obviously nothing is ideal so you will need to charge it for slightly longer. Most cell phone chargers output 1 amp, and most tablet chargers output 2 amps. All USB chargers output 5V DC. There should be some fine print somewhere on the charger it might say Input: 110-250 V AC 500 mA Output: 5 V DC 1 A. Beware of bluetooth headset chargers as it might take up to 4 days to charge with 250 mA.
952975
Your phone holds a charge depending on condition of your battery, size, and life expectancy. It has nothing to do with the charger itself.
870871
The separate charger is meant to ensure you have a spare that is always charged. The battery in the phone can be charged in the normal way with the micro usb plug. This comes in a pair so you always have a warm/hot spare. Just like all rechargeable batteries do not keep the spare plugged in all the time, at least once every two weeks or so, i swap mine out so they get equal charge/discharge cycles. Hope that answers your question.
1905152
I bought this product, if it in the 30 days send it back. Mine was pure junk. The anker astro 3E works great, it cost more. The anker has been in use four almost 14 months, I get two charges on my droid razr maxx hd, it has a huge battery. Good luck
2101947
Don't actually know the specifics of the USB outputs. I di know that it easily charges my android HTC ONE cell phone adequately while plugged into an AC outlet, by the internal rechargeable battery and with the optional external rechargeable battery you can purchase separately. The external batteries are worth their weight in gold for use on the go. I bought 2. These batteries have lasted 10-15 hours with constant music playing in a beach setting. THEY ARE ABSOLUTELY AWESOME, and are only about $25 each. Anymore questions I can help you with?
400912
This is the only device I have used so I cannot compare it to others. It stays fully charged for months. I just carry it in my bag and it only seems to really discharge when you are using it. You can attach it to your phone and make a call, or plug it into your phone and it will charge your phone. So basically it will charge your phone fully and then have some juice left. I haven't used it much. Seems to work well! Mine is a Droid Razr Maxx, and my friend used it on her non motorolla phone too, so I think it would also charge an Ipad or Kindle, anything with that same connector. So if you phone holds a charge all day, this will get you another day basically. This is the only device I have used so I cannot compare it to others. It stays fully charged for months. I just carry it in my bag and it only seems to really discharge when you are using it. You can attach it to your phone and make a call, or plug it into your phone and it will charge your phone. So basically it will charge your phone fully and then have some juice left. I haven't used it much. Seems to work well! Mine is a Droid Razr Maxx, and my friend used it on her non motorolla phone too, so I think it would also charge an Ipad or Kindle, anything with that same connector. So if you... » Read More This is the only device I have used so I cannot compare it to others. It stays fully charged for months. I just carry it in my bag and it only seems to really discharge when you are using it. You can attach it to your phone and make a call, or plug it into your phone and it will charge your phone. So basically it will charge your phone fully and then have some juice left. I haven't used it much. Seems to work well! Mine is a Droid Razr Maxx, and my friend used it on her non motorolla phone too, so I think it would also charge an Ipad or Kindle, anything with that same connector. So if you phone holds a charge all day, this will get you another day basically. « Show Less
1760912
Device has standard 5V 1Amp and 2.1Amp outputs. If you have an adapter USB to Apple and the Apple device will take either of the two outputs you should be OK. Device stays charged for a long time without significant discharge. Longest I have had without discharge is 4 months.
1233805
I bought this for my wife and I think the longest she has had it in her purse without using it was about 3 weeks. When she went to use it again it had enough charge to keep her iphone 4 going until she was home. Then she used it for the next several hours because she didn't want to get up and look for the ever elusive iPhone cable and adapter.She's not diligent about keeping it charged and it has always had enough charge when she needed it. We've got a satellite TV receiver in the kitchen with a usb port and out of cconvenience she uses that port to keep it charged. From that port it takes about 30 minutes for a full charge. I'm sure it would be faster with an ac adapter. I bought this for my wife and I think the longest she has had it in her purse without using it was about 3 weeks. When she went to use it again it had enough charge to keep her iphone 4 going until she was home. Then she used it for the next several hours because she didn't want to get up and look for the ever elusive iPhone cable and adapter.She's not diligent about keeping it charged and it has always had enough charge when she needed it. We've got a satellite TV receiver in the kitchen with a usb port and out of cconvenience she uses that port to keep it charged. From that... » Read More I bought this for my wife and I think the longest she has had it in her purse without using it was about 3 weeks. When she went to use it again it had enough charge to keep her iphone 4 going until she was home. Then she used it for the next several hours because she didn't want to get up and look for the ever elusive iPhone cable and adapter.She's not diligent about keeping it charged and it has always had enough charge when she needed it. We've got a satellite TV receiver in the kitchen with a usb port and out of cconvenience she uses that port to keep it charged. From that port it takes about 30 minutes for a full charge. I'm sure it would be faster with an ac adapter. « Show Less
1646138
My long-term self-discharge test shows that the AmazonBasic (Black) NiMH cells can hold ~73% of charge after 6 months of storage. In contrast, the Sanyo eneloop cells were tested to retain ~85% of charger after 1 year of storage. By the way, nowhere in the description of AmazonBasic (Black) NiMH cells claim that it can be recharged 1500x.
194402
I would guess several hours, I didn't keep it in constantly after a charge, but using it 20-50 minutes at a time a few times a week, it lasted over a month for me.
2154690
I'm using this with rechargeable batteries since around 5 months without any issues. The ones I'm using are from Eneloop (http://www.amazon.com/gp/product/B009LU9150/ref=oh_details_o09_s00_i00?ie=UTF8&psc=1), wonderful capacity; charger I'm using is also from Eneloop only (http://www.amazon.com/gp/product/B0058GZWXQ/ref=oh_details_o09_s00_i01?ie=UTF8&psc=1)
18798
I have an HTC Evo, as I think the answer depends upon one's phone also. I can get a complete full charge plus have a little left over. Like a previous post, I only use this as a backup when I don't have other charging options. It definitely gets me through the day, even if I have no other charging available. It is an excellent power pack.
845172
According to the information I read the built in charger is a float charger meaning it will not overcharge if left plugged in. There is something else offered if you keep it in your vehicle, they will send you mail when it will need a recharge based on when it was last charged. I might add I am very pleased with the performance of this unit.
181904
I honestly can't say "YET" anyway. I was using Iphone4 when I purchased and now I just changed over to a Galaxy Net 3 on Android system. The charger for the Galaxy is totally different but I know i can use it with an adapter no doubt. The backup power is great for a variety of items with the USB and micro USB port, you just need to find an adapter to plug into the powerrock on one end and your Android device on the other. I love this little bugger it's so portable, it just doesn't hold the charge for a long time if you don't use it. But it is not intended as a routine power source just something to get you past a pinch period. Love it! I honestly can't say "YET" anyway. I was using Iphone4 when I purchased and now I just changed over to a Galaxy Net 3 on Android system. The charger for the Galaxy is totally different but I know i can use it with an adapter no doubt. The backup power is great for a variety of items with the USB and micro USB port, you just need to find an adapter to plug into the powerrock on one end and your Android device on the other. I love this little bugger it's so portable, it just doesn't hold the charge for a long time if you don't use it. But it is not intended as a routine power source... » Read More I honestly can't say "YET" anyway. I was using Iphone4 when I purchased and now I just changed over to a Galaxy Net 3 on Android system. The charger for the Galaxy is totally different but I know i can use it with an adapter no doubt. The backup power is great for a variety of items with the USB and micro USB port, you just need to find an adapter to plug into the powerrock on one end and your Android device on the other. I love this little bugger it's so portable, it just doesn't hold the charge for a long time if you don't use it. But it is not intended as a routine power source just something to get you past a pinch period. Love it! « Show Less
1176267
Not sure I understand the question. I use it to recharge my device, not as a supplementary power supply.Mine holds a charge for about 3-4 weeks.It charges my Iphone 1-1.5 times on one charge.
154551
if the phone doesn't last a full day, the back isn't charging, but if it lasts almost 2 days then the back is charging.You should be able to tell within 2-3 hours, because if your battery is dieing really fast that means there is a problem. the anker battery (not the extension) is only 2000mhz where a normal batter is 2600mhz so it will die really fast. Just a note i really dislike the flip cover so i ended up cutting it off, it probably voids warranty but w/e.