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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.READ FULL REVIEW
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
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
This review is from: GIGABYTE GA-P31-ES3G LGA 775 Intel P31 ATX Intel Motherboard
Pros: can run at 1600 FSB like it claims though the north bridge gets very hot (with a 1066 cpu). I'll have to try and attach a fan. I haven't tried to go faster as I'm afraid that it will fry more memory and I'm at the lowest memory multiplier.
Cons: I had some very expensive mushkin 1066/5-5-4-12 memory (costs twice what the motherboard does). it ran fine for 2 days (though the default timings were set about twice what they should be). I tried a lower multiplier in preperation to OC the cpu, and bye, by memory (it fried underclocking or at least stopped posting). Stepped through trouble shooting with gigabyte. Other ddr2 800 memory kept trigering a bios checksum error screen even after resetting bios and clearing cmos. After stepping through it with tech support (tried resetting and various ways of clearing the cmos), they said bad memory controler). I exchanged the board and same behavior with all the memory. I checked the timings/voltage on the ddr2 800 and they were way off. I fixed the timings and the bios checksum error screen went away (voltage was too low but it was working).
Now it works but one of the mushkin sticks is dead (one posts, the other doesn't). I'm afriad to go past stock with the ddr2 800.
Other Thoughts: Board is narrower than spec so the heatsink sits right next to the exaust fan (so much for the larger heatsink I bought). I hope you know how to set timings manually as this board can fry it underclocking. I'm still not 100% sure the memory is dead (acodrding to their memoory compatibility list, 1066 support is terrible), but both sticks worked, now only one even posts so I'm guessing one is dead, and this memory is irreplacable (they don't make it any more). I should have spent more on a better board.READ FULL REVIEW