I bought this 2500mAh device and it is just enough to charge a 1750mAh HTC EVO 4G new battery. Why there is such big difference in actual capacity?
51475
That's because the charging involves two power conversion steps. First, the power bank's internal 3.7V battery voltage has to be boosted up to 5V at the USB port. Next, the 5V is down-converted to charge the 3.7V internal battery of the target device. Even if both steps are 85% efficient, you still lose 30% of energy in the whole process. 2600mAh * 0.70 = 1820mAh.
1596760
The 5200mAh is in reference to the battery capacity- meaning 5200 milla-Amp-hours or 5.2 amp hours. The amp-hour can be misleading though. Basically the 5.2 amp hours means it can last 5.2 hours with a load of 1 amp or 1 hour with a load of 5.2 amps. The ports are only 1 and 1.2 amps because a USB port is only 5 volts. Most accessories charge at a slow amp so the battery does not get real hot. (this reduces the life of the battery) The higher the amp output the faster the battery charges but the hotter it gets. Typically battery chargers will have an initial high amp output to charge fast but then slow it down so the battery does not overheat. Components (resistors, capacitors, IC chips so on...) dissipate electricity in the form of heat. If they get too hot they get damaged. Same concept for a battery. By making this thing only output the 1 or 1.2 amps it can cover a wider variety of electronic devices. You can always charge your phone (or whatever) with a lower amp charger. However, you never want to plug it into a charger that is a higher rating then your device. You will break it. My Galaxy S4 charger is 2.1 amps (I think). The only thing it would do is take a little longer to charge (and not get as hot when you touch it).
107008
The ones I most recently bought are 2000mAh typical, 1900mAh minimum. They do have a new type that are 2400mAh but there's a cost. The lower capacity have a minimum number of discharge/recharge cycles of 1500. The larger capacity ones are only 500 cycles. Make sure you consider your use case.
967802
The 2200mah allows for more battery hours which is why the performance of this battery is better than the mfg original battery. Although they claim that at times higher mah can make for a larger or heavier battery, I did not experience that with this battery - fit perfectly. http://www.phonescoop.com/glossary/term.php?gid=194
32719
Just got mine today. Haven't tested actual capacity but with 18650 batteries inside it looks that is actually probably around 15,000 mah. I'm going to test by fully discharging a device that is 5000 mah. If i can't get enough recharges to be impressed I'll be returning mine.
1208113
Total power storage is 6000mAh. Output level is 1 amp, which I consider insufficient for a device of this level. There are devices for less money that product 2 amp output.
1092318
4 AA 2500mAh batteries in 5 hours so 4 x2000 in 4 hours or 500 ma per hour. Won't make any difference what your charging source is, it only draws 500 ma
574499
I can't really understand your question but some android phones sometimes drain faster then they charge because the output isn't high enough on these portable chargers. IPhones don't do that because they are under clocked out of the box farther than android phones
391621
I had a 4700 mah extended battery on my phone and it fit just fine. I like the Seidio brand. I have upgraded to a Samsung Galaxy Note 2 since then and this phone works several times better. I had a lot of problems with the HTC EVO 3D. It is hard to sell over $50 now since it doesn't work that good and there are soo many phones that work better than it. I hope you can find out if it works for you.
478991
The E4 is rated at 13000 mAh, the E5 at 15000. So it's a higher capacity pack and has more juice to charge your devices. Honestly I have the E5 and it has plenty of power to charge multiple devices. I don't imagine you lose too much with the E4.
1281706
The Limeade 18000mah has more capacity than the Jackery. Other than that features seem much the same.
1225742
If u look up ah on the internet it tells u that the higher the number the longer the battery runs. If u r replacing the old batteries and still use the same case the charger is the same unless the original batteries are 12ah. Then check the charger to see if is meant to handle a larger capacity. I found mine worked great but the charger adapter is loose so the charge doesn't hold long. I need new charger available on Amazon.
999417
This works like a bigger battery, that can be charged over and over again. So you charge it and then you can use to charge a device/phone. With my HTC android phone on position 1 or 2, I can get 1 full charge. The 3 position are not well described, except how many milliamps (ma) are outputted.
44552
The included charger is rated at 1000mA, but my Nexus 7.2 only shows "USB charging", which I believe is 500mA. I hooked it up to my S4's factory 2000mA charger and got the same results. This is probably because the Nexus (and other devices) look for the two data pins, D+ and D-, to be shorted together electrically to indicate that the charger is high output capable. Since the Slimport adapter uses these two pins to transmit video data, they can't be shorted together and therefore the charger is limited to 500mA. That's not really Patuoxun's fault, it's just a limitation of the technology so any other Slimport adapter is likely to do the same thing. I hear that Slimport doesn't use as much power as MHL adapters, so this charge rate may be enough to keep the battery at whatever level you start with, or it may go up or down slightly. Haven't used it yet enough to find out.
1392028
I don't know what am HTC evo "v" 4g is? ... My EVO 4g is abt 3 yrs old.For that it works fine. Great having the charged spare. I use the heck out of my Sprint data... Most days I used to kill the original battery in 1/2 day. Now I can go through most days and not get to red until late p.m. or not at all. The charger works fine, just line up the little metal tabs to the battery and charge. Light turns blue when charged.
431724
Because it's a much nicer charger and it charges at higher amp rate. Nite core is slow. Or get an e fest luc on eBay.
167648
Thanks for the input, i bought this couple of months back.Great product but lowest charging amp is 200mah.Was hoping for 50mah.