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Eagle Tech Black 10000 mAh External Battery Pack w/ Dual USB for Tablets & Smartphones ET-NP100K-BK

  • Lithium Polymer
  • 5 Volt
  • 2.1A + 0.5A

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  • Specifications
  • Warranty & Returns
  • Reviews

Learn more about the EAGLE TECH ET-NP100K-BK

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details

Customer Reviews of the EAGLE TECH ET-NP100K-BK

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  • Richard H.
  • 6/15/2014 12:08:14 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsupdate to previous review

Pros: decent capacity

Cons: won't stay charged
charge rate is slower than claimed

Other Thoughts: This is an update to my previous review now that I have had it for a while. mine worked fine at first but with occasional use it now does not hold a charge very long. I bought 2 and they both do it. If you are going to use it every day then fine. If not, you have to spend a couple of hours charging it. before taking it out as it starts loosing a significant amount of charge within a couple of days. Constantly having to charge it when looses its charge is probably going to shorten its life too. lithium batteries have a limited number of charges.

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  • Anonymous
  • 3/2/2014 11:10:15 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsBattery does not hold charge.

Pros: So its a battery inside a case which is kind of nice because you can replace the internal battery.

Cons: Battery does not hold a charge for more than a couple days. Even with a good charger it can still take a few hours to charge this thing fully. Because it keeps losing power it's a bad battery to keep in case of emergencies.

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  • marvin w.
  • 12/14/2013 3:31:53 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month

2 out of 5 eggsI would go with the rav power

Pros: none

Cons: really slow and the power meter went to empty after one charge of my HTC one. 10000mah ha Think again . large and bulky metal casing feels super flimsy. battery meter needs to be button mashed multiple times to turn off

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  • Anonymous
  • 10/31/2013 7:46:18 PM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggs10000 mah Battery

Pros: does what it is supposed problems

Cons: none

Other Thoughts: Everything that I need to charge has it's own power cord so I use the specific cord from each to charge from the external power pack. Great little battery....charged my Zoom tablet 4 times and still had juice

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  • Richard H.
  • 10/16/2013 12:04:48 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

3 out of 5 eggsDecent battery

Pros: Decent capacity if you understand how these devices are rated, works good, it might actually have the stated 10,000 mah capacity battery it claims or in the ballpark (capacity test later in the review).

Cons: Doesn't seem to actually put out 2 amps
Poor instructions
Could come with more accessories

Other Thoughts: It doesn't matter that it is less capacity at 5v where most devices are concerned. Most devices have that same 3.7v lithium ion battery so you would get 10,000 mah charge. 3.7v is the nominal voltage too. A fully charged lithium ion battery is 4.2v . They of course are not 100% efficient. It doesn't really matter anyway as the 10.000 mah rating could be bogus regardless of what is labeled on the battery pack. Many of these types of devices have much less capacity than they claim. I opened one of mine up and it had 2 2100 mah cells so 4200 mah (pack was rated at 5600 mah). Based on performance, the cheap Chinese cells were not even putting out half what they were rated at (not uncommon with cheap cells).

What will loose power, and could be considered deceptive if you don't understand how battery charging works, is the efficiency. lithium batteries are the best choice for such devices. That is why pretty much every tablet, smart phone etc uses them. They use 5v charging so that it can be easily charged with common chargers or through a computer usb port which I also consider a smart move. When you step up the lithium battery to the needed 5v, you loose some energy in the process. When your device (phone, tablet or whatever) steps that power back down, it looses some. When a lithium battery charges, it looses some. This is why you do not get 10,000 mah worth of charge on your device out of a 10,000 mah battery. They could not possibly rate how much charge your device will get, as the efficiency of devices can very greatly. Some users have reported that their ipads get around %80 efficiency, so 20% percent of the power is lost plus what the battery pack loses converting.

I wish others would review these devices in the way I'm about to, because its the only thing short of using test equipment that gives any meaningful info on capacity (ballpark capacity). The battery could say its 10,000 mah and only be 3000 mah (and there are ones that are like that or worse), so calculations based on stated capacity are worthless.

Mine got 6800 mah worth of battery charge in my first test. A professional review I read claimed about 6200 mah (it is going to very depending on the efficiency of the devices you charge).

Here is how I got that. I charged a 7" tablet for 2-3 hours with the tablet off and it only charged from 23% to 56%. I turned it on in airplane mode to minimize power use. It didn't seem to charge faster. So it charged to full. Its a 4000 mah battery so thats 3080 mah of actual charge the battery received.
next a 9" tablet with a 4000 mah battery, charged from 13% to full, so 3480 mah (tablet was on).
Last a 7" tablet with 3000 mah battery from 20% to 28% so 240 mah (tablet was off).

Total actual charge is 6800 mah. A little power was probably wasted with the tablets being on in standby. Seems the actual battery capacity is close to what its rated.

3.5 stars (4 stars or more if it had actually charged at 2100 ma

5 out of 6 people found this review helpful. Did you? Yes No

  • Daniel G.
  • 10/14/2013 4:36:38 PM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsNOT 10000mAh as claimed!

Pros: Small, but over-rated

Cons: The internal battery is 3.7 volts (NOT 5.0 Volts) and 10000mAh. Unfortunately, this means that the charing device itself is severely over-rated. When the sub-standard battery voltage is stepped up to 5.0 Volts, a maximum of 6660mAh USB charging capacity is delivered, assuming a 90% conversion efficiency. This is 2/3 the stated capacity.

2 out of 4 people found this review helpful. Did you? Yes No

  • Theodore C.
  • 10/13/2013 5:08:55 PM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

2 out of 5 eggsHow do you

Pros: Appears a good unit.
Like the case.

Cons: Poor instruction manual
No charger for the battery
No charger for the battery (had to say this twice)
Only one cable, two output ports
Power switch does not work well

Other Thoughts: Not sure why they would make and sell a battery that is supposed to be used to charge something without a way to charge the battery itself. Is this just oversight, stupidity, or just a way to save money and make it cheaper?

1 out of 3 people found this review helpful. Did you? Yes No

  • Daniel R.
  • 5/29/2013 2:28:03 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week

3 out of 5 eggsEagle Tech

Pros: This is in theory a great battery

Cons: But -- Eagle Tech needs to come clean and let everyone know whether the replacement battery will actuallyl be available -- otherwise this batt/enclosure has far less attractiveness...

2 out of 18 people found this review helpful. Did you? Yes No

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