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Lumsing® 4000mAh Ultrathin Portable Power Bank External Battery Pack Backup Charger for Apple: iphone 6 plus,5s,5c,3gs, iPad 4, iPad Air2,1, iPad Mini3,2; Samsung Galaxy S6 edge,S5, S4, Note 4, Note 3, HTC One, Evo, Droid Dna, Motorola Atrix, Droid, Google Glass, Nexus 4, Lg Optimus and Other Usb-charged Devices
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- 4000 mah of capacity, full charge iphone 5s 2 times, full charge Samsung Galaxy S4 1.5 times.
- 5V/2.1A output interface; 5V/1.5A input interface, if you use 1.5A adapter it can power itself more quickly to the mobile charge (not equipped), the charging time is about three hours.
- ultra-thin brushed aluminum shell with embossed metal LOGO, Highlight product quality
- Ultra Slim, Palm-Sized Portability。PERFECT for long plane flights, road trips, or whenever you need to charge your mobile devices wherever you are.
- Made with great A lithium polymer battery and premium microchips,within CE, FCC, ROHS certification ensures reliability; 500 + recharge cycles over the life of the battery.
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Lumsing®- Connecting Simple Life
Keep connecting, keep simple. Time is limited, but things needed to be done are so many. Lumsing aims at helping you release your time and enjoy wonderful life. Want to be always on the go? Lumsing can help!
--Battery: A lithium polymer battery product
--Input: Micro USB 5V / 1.5A
--Output: USB 5V / 2.1A
--Dimensions: 3.74x2.56x0.31 inches
1 * Lumsing Power Bank
1 * Micro USB spring charging cable
1 * User Manual
1 * Lumsing user card
About us:Lumsing® has always devoted itself to providing fashion and superior products with the end-users, so that you could enjoy the leisure shopping experience at the same time.
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Top customer reviews
It charges by connecting the supplied USB lead to a computer/laptop or other USB charging port. When both blue LED lamps are illuminated it is fully charged and the USB cable can then be reversed to the micro USB plug is used to charge USB devices such as a mobile phone, tablet, bluetooth keyboard MP3 player, sat-nav etc. For anyone with a blackberry, iPad, iPhone or other gadget requiring a non-micro USB charging plug then an additional lead will be needed. In my case, everything charges via micro-USB.
I have found this to be a very reliable powerbank and it has provided much-needed power at times when I needed it most, particularly in the current cold weather and living in an area of very poor phone reception where my phone battery doesn't last long.
It is easy to carry and I tend to carry it permanently in my back pocket - it's so small and lightweight that it's easy to forget about until needed when it can provide 2 recharges for my phone.
It's not the largest powerbank either in terms of its small size or its 4000mAh capacity but it's there when it's needed, performs as it should and this is what's most important. With its metal casing and quality build it providing power and reassurance for several years.
A good buy for anyone who needs to recharge any USB device away from a mains (or 12v) power supply.
Its case is smart-looking matt-finished aluminium with smoothly rounded sides. Its charge level is displayed by two small blue LEDs, each representing 50% of remaining power. The unit powers up automatically when a device is plugged in for charging. There is also a super-bright LED torch feature which is activated by pressing the power button twice ... it's certainly bright enough to find one's dropped keys!
It has a relatively small-capacity 40000 mAh lithium-ion polymer battery but is capable of charging an iPhone 5s twice from a fully-charged power bank and will take just over three hours to fully charge the powerbank from completely flat if using a 1.5 Amp charging source* Happily the bank is supplied with around a 75% charge, so it can be used straight out of the box. Oh! The box ... this product is very neatly packaged and would make a great gift.
The power bank has 1 USB output port (rated at an impressive 2.1A) and a micro USB charging port. The power bank is supplied with a rather smart spring (curly) lead that easily extends to 50cm and then retracts back to its shorter length ... a great idea! Obviously one can use one's own cables, indeed, the supplied cable might be a little short if one wants to use a phone whilst it's charging; but it's a great addition in my opinion.
As mentioned at the beginning of the review I've had this product for around a fortnight and it retains its charge exceptionally well. It can be charged from a computer's USB port, or a phone charger; however, to get the power bank fully charged as quickly as possible it's worth connecting it to a higher capacity charger rated at 1.5 Amps.
So ... overall I am very pleased with this Lumsing power bank due to its compact size. The fact that it holds its charge for a good length of time means it'll still be able to charge one's phone even if I've forgotten to recharge the power bank. From a safety point of view the device has over heat, current and charge protection. It meets United States and European standards as well as meeting standards for use of hazardous chemicals; very reassuring.
Definitely worthy of one's consideration.
*The maths! ...
One might imagine that a 40000 mAh power bank could recharge a Smartphone's 2000 mAh battery twice (well that's what I thought anyway!) Here's the answer ...
Firstly, how long will it take to charge a power bank from completely empty to full? The re-charging time depends on the capacity of the power bank, its remaining power and the power supply used.
For example, in the case of the Lumsing unit: Power bank= 4000mAh (0% remaining). Power supply input = 1500mAh , although this value is reduced by 20% due to power loss in the charge / discharge process.
The calculation therefore is 4000mAh / 1200mAh = 3.3 hours.
How many times can a power bank charge a phone?
A similar formula applies to calculate number of times a power bank can charge a phone.
For the Lumsing: Power bank: 4000mAh, phone battery: 1500mAh (an iPhone 5s has a 1560mAh battery)
The calculation is (4000mAh x 90% x 80%) / 1500mAh
= 2880 / 1500
So roughly 2 times (assuming the phone's battery is completely drained).
Why the 90%? This assumes the power bank can conserve up to 90% of its power. 80% was explained earlier.
I found it interesting anyway !
It comes with a short black coiled USB cable which can be used to recharge the bank from your own power source and reversed for charging your phone if it has micro USB. Not sure being coiled helps much as it adds bulk to the cable and springiness which the light-weight end items (phone & bank) cannot resist against to utilise the longer cable length. I would suspect most people will use their existing USB device cables any way because no adapters are supplied to make the micro usb fit other sockets.
Has two blue LEDS for Full/half full empty indication and the obligatory ‘torch’ which seems to adorn all these banks.
Cant argue with the price though.
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