Verdict
A perfectly sound form of insurance policy for your phone shelling during long days . It wo n’t deliver anything close to 5000mAh output signal , the USB connexion is dated and speed are nothing extra . But it ’s inexpensive enough these are n’t of necessity a lot - surf .
Pros
Cons
Key Features
Introduction
The EnergyCell Slim 2 Power Bank is as close as I ’ll get to reviewing a totally generic assault and battery . The label says it ’s design in California , made in China , but the invention here is so generic any claims of US heritage are pretty meaningless .
However , it costs £ 9.99 and is pop onAmazon . If the EnergyCell Slim 2 Power Bank can issue the goods it promises , there ’s no major reasonableness to sound off . Does it ?
Mostly . This is a solid no - nonsense battery large number you could sling in a bag or coat sack for emergencies . However , thanks to its depleted efficiency it ca n’t supply anything near 5000mAh , and this suggests it does n’t utilize the beneficial - quality internals .
Design
The EnergyCell Slim 2 Power Bank is a piston chamber , like an oversized stick of lip rouge . This sort of shape is practical for these small power banks because they typically utilise cylindric battery cells .
Its outer is plastic , include the silver band towards its upper section . There ’s no alloy to the outer eggshell , which would likely just attract more heat than the respite of the exterior anyway .
The EnergyCell Slim 2 Power Bank is almost as basic as these battery camber descend , and it ’s date in one annoying way . It utilize microUSB to excite , rather than the USB - C that has been ubiquitous for years .
Amazon ’s listing suggests this fashion model has been on sale since 2022 . Almost all appliance had stir to USB - C long before then . However , it does include a microUSB cable system so you wo n’t require to moil one out from your empty cable mound .
There ’s no USB - C at all here . The socket you use for charge is a USB - A , which may be an subject if you have a fairly new phone that has a USB - C to USB - C commission cable .
A melody of four LEDs sits by these two connectors up on one end . They rest lit while charge the battery , and you could get a quick coup d’oeil at the charge level by pressing the button on the side .
The obvious point of failure is the light-emitting diode Button . But , hey , some of these punk bombardment bank last an age . I have a tenner - old TP - Link one that ’s trucking along just fine .
No part of the EnergyCell Slim 2 Power Bank feel expensive , but it ’s not worryingly made either .
The EnergyCell Power Bank is perhaps a little large to slot comfortably into a pocket , but it is among the little units with 5000mAh mental ability . A jacket crown pouch or suitcase is the ideal resting place for this small guy .
It ’s roughly 27 mm in diameter , 105 mm long , make it little than the median pen but right smart longer than the AA battery it may remind you of from a glance at its prescribed images .
There are no ruggedization claim here . There ’s no water resistance rating , and no military - grade testing . And I ’d be profoundly sceptical of any superpower bank this cheap that makes those claim anyway . This is a no - gimcrackery , practical accouterment for the great unwashed who need to ensure their earphone can stay charged a full day or two .
Performance
There are no big numbers involved in the EnergyCell Slim 2 Power Bank ’s performance either .
As you’re able to see from the grading on one goal , it hold in power at up to 5V , 2A ( 10W ) and spits it out at up to 5V , 2.1A. And it claim to have capability of 5000mAh , or 18.5Wh .
I found that , from a fully depleted state where it would no longer charge anything , the EnergyCell Slim 2 Power Bank could take in 18.17Wh . That ’s 4910mAh based on the standard token battery potential drop of 3.7V.
A full direction took 133 minutes , and the charging rate was slightly higher than claimed . My trial equipment commemorate 11.6W , rather than 10W , the excess likely turn a loss through inefficiencies in the explosive charge path .
As you ’d desire for such a downhearted - magnate barrage fire bank , the EnergyCell Slim 2 Power Bank does n’t really get spicy when charging or discharging , just a little tender . And its burden rate is all right until around the 80 - odd percent mark ( which takes around 80 bit ) , where it slows down to around 5W.
The EnergyCell Slim 2 Power Bank ’s weakness is efficiency . Despite sucking up 18.17Wh of juice , it only put out 11.4Wh to the gimmick being excite .
That ’s equivalent to 3081mAh in the phone industry criterion , give the EnergyCell Slim 2 Power Bank just 62.7 % efficiency . And that does n’t calculate for additional exponent expiration at the phone ’s closing . Have you note your phone getting warm when it buck ? That ’s more energy being drop off .
This is a cheap battery pack , and its performance is absolutely in railway line with that too . It neutralise a in effect amount of electrical energy , and can only really fully recharge a 3000mAh - odd phone at safe , not a 5000mAh one .
There ’s its charge pace to consider too . I recorded 11.7W yield , similar to the advertised figures , We ’re not close to real fast charging figures here .
All of this matters much less if you want a power bank for emergency use , or to keep clothing or earphone charged up . Do n’t grease one’s palms one for laptops . There ’s not enough juice , and many wo n’t even start to charge thanks to the special 5V end product .
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Should you buy it?
It ’s sleazy , it ’s not too large and it has good claimed bombardment capacity . This is n’t a bad paroxysm , particularly for humble - power devices.&bsp ;
canonic power banks like this are quite slow . But the part you ca n’t tell by the numbers is that this one is also quite ineffective , only delivering 60 - unexpended pct of the great power put in . MicroUSB also feel passing - date in 2024.&bsp ;
Final Thoughts
Let ’s tangle out that old cliche : you get what you pay off for . In most common sense , the EnergyCell Slim 2 Power Bank is exactly what it appear to be . It ’s a small , mid - size portable barrage fire pack with limited output , suitable for dense charge phones or for less demanding accessory .
Its power efficiency is really quite humbled , though , at 62.7 % . Perhaps that does n’t matter for occasional consumption , but it means you wo n’t get close to fully charging a 5000mAh phone , and it ’s a bit wasteful power - judicious .
Trusted Score
How we test
We good try every power money box at Trusted Reviews , using a USB Voltimeter to not only test element like maximum wattage but to mensurate its entire output to win insight into efficiency and more .
FAQs
It only has USB - A and microUSB connection .
modified capacitance make it a poor fit for laptops , and some wo n’t point at all thanks to the 5V turnout voltage .
It can excite such phone , but will only fill them up by around 60 % maximum according to our examination .
