Anker is at present the market leader in power banks even as RAVPower and Aukey have emerged as popular power bank and charger manufacturers. In addition to offering power banks, wall chargers, and cell phone accessories, both RAVPower and Aukey offer many products with features and functionality not provided by any Anker products.
RAVPower has usually been quicker with innovative additional features compared to Anker and often launches products with interesting feature-mixes not offered by Anker. In our experience, RAVPower power banks offer the same quality, features, and customer service as Anker at a lower price. Aukey on the other hand largely targets the value-end of the market and many of its power banks cost much lower than comparable products from Anker and RAVPower. However, so far our general impression is that Aukey products are behind Anker and RAVPower in terms of build quality. Also, Aukey power banks are usually bulkier and heavier than Anker/RAVPower and this counts against Aukey power banks.
We will compare, test, and analyse performance and features of Anker, RAVPower, and Aukey across various battery capacities and three major fast-charging technologies (USB-C PD, Quickcharge 3.0 and 2.4 amp charging).
26800mAh power banks with USB PD (5-7 full charges)
20000mAh power banks with USB-C PD (4-5 full charges)
20000mAh power banks without USB-C PD or Quickcharge 3.0
Powerbanks with USB PD
|Anker PowerCore 26800 PD 45-watt||Aukey 26500 PB Y7||RAVPower 26800 PD||Which is Better?|
|Both RAVPower 26800 PD and Anker PowerCore 26800 PD are the winners>/br> If you want a bundled wall charger , go for Anker 26800 PD If you do not need the bundled wall charger and want a quality reasonably priced PD powerbank, you can go for RAVpower 26800 PD|
|Price||RAVPower and Aukey are priced the lowest|
|Max PD Output||45 watt||30 watt||30 watt||Anker|
|Time to charge the powerbank||3.5 hrs using USB PD charger||5 hrs using USB PD charger||5 hrs using USB PD charger||Same|
|Size||7 x 3.1 x 0.9 inches||7.9 x 3.78 x .9||6.77 x 0.79 x 3.15 inches||RAVPower|
|Battery Capacity||26800 mAH||26500 mAh||26800 mAH||Same|
Anker PowerCore 26800 PD 45-watt is a solid power bank with higher 45-watt PD output . Anker PowerCore 26800 PD comes conveniently bundled with the Anker 60 watt USB C PD wall charger. Both of these are hand down our favorite choice as future proof fast charging power banks for the latest iPhone 11, 11 Pro, 11 Pro Max, XR, XS, X, 8, 8+ and Samsung S10 S9, S8, S7, Note 10,9, 8 etc.
Aukey PB Y7 25600 is 25% heavier (20 oz+) than RAVPower or Anker USB PD power banks. It is also quite thicker as well (1.15 inches vs 0.9 inches for Anker/RAVPower) . It does come with additional QC 3.0 port though the performance of QC 3.0 and USB-C PD 18 watt is quite close. Aukey does not offer any price advantage as well to justify the extra weight and bulk.
26800 Mah PowerBanks – Understanding Different Types of Power Banks
26800mAH is the maximum capacity for powerbanks that is allowed by the TSA on flights. With 26800 mAH, you will get 5-6 full charges for Galaxy S10, S9, S8, or S7 or iPhone 11, 11 Pro, 11 Pro Max, XR, Xs, X and 8-9 full charges for iPhone 8 and 7/6S. We can classify 26800 mAH powerbanks in three main categories:
26800 mAH with no USB PD or QuickCharge – These are lowest cost powerbanks. Features to look for in these are 2.4 amp ports for charging iPhones 7, 6, 5 etc at maximum possible speed and Androids at decent speeds. Also more ports and more total current output, the better and stable is the output for simultaneous charging. Weight and bulk are also very important due to the high capacity. Look for 2-amp input charging to charge the powerbank in about 12-14 hrs.
26800 mAH with QuickCharge 3.0/2.0 – Look for minimum QC 2.0 (18 watt) compatibility as this is becoming the standard these days. All recent Samsung phones such as S8, S9, S7, Note 8, Note 5 etc. support fastest charging at 18 watt (equal to QC 2.0). QuickCharge input for charging the powerbank itself in 4-5 hrs is also very important as these huge powerbanks will take 28 hrs or more to charge with a 1 amp regular wall charger.
26800 mAH with USB C Power Delivery (USB PD) – USB PD is emerging as the charging technology of choice in 2018. Both Google Android and Apple (11, 11 Pro, 11 Pro Max, XR/XS/Max, iPhone X, 8, and 8+) support fast charging over USB PD. Look for maximum output in watts over USB PD possible. Minimum 18 watts is required for fast charging Samsung/Apple smartphones and Nintendo Switch. 30 watt or more is handy for charging Macbooks and iPads at fast speeds. USB C PD input charging is also a must to recharge the powerbank in 4-5 hrs.
|Anker PowerCore+ 26800 without wall charger||Anker PowerCore+ 26800 with wall charger||Aukey PB Y7||Which is Better?|
|Anker PowerCore+ 26800 is the winner here due to its superior performance and features. It also gets charged using QC 3.0 wall charger in 5 hrs which is a must for any good QC 3.0 powerbank|
|Battery Capacity||26800 mAH||26800 mAH||26500 mAh||Anker|
|Weight||20 oz||20 oz||21 oz||Anker|
|Time to charge the powerbank||5 hrs using a QC 3.0 charger||5 hrs using a QC 3.0 charger||8 hrs using combined USB-C - micro)USB wall charger||Anker|
|Performance, stability & reliability||Anker|
|Size||7 x 3.1 x 0.9 inches||7 x 3.1 x 0.9 inches||7.9 x 3.78 x .9||Anker|
Anker PowerCore+ 26800 is the better product here in all aspects. While the features and weight of both powerbanks are similar, Anker PowerCore+ 26800 does manage to deliver better charging 5-6% better capacity performance compared to PB Y7 in our tests due to more efficient circuits in Anker. Anker PowerCore+ 26800 gets charged much faster (5 hours using a QC 3.0 wall charger) and is also the sturdier product among the two as well.
Aukey PBY7 is a 30000 MAH QC 3.0 powerbank and goes above the TSA’s 27000 mAH battery limit. Also, despite being a powerbank for Quickcharge 3.0 phones, the Aukey PB Y7 powerbank itself cannot be charged quickly using a QuickCharge 3.0 wall charger like the Anker PowerCore+ 26800 . It takes 8 hrs to charge PBY7 using a cumbersome dual USB-C/micro-USB C mode.
Powerbanks without USB PD or QuickCharge
|Anker PowerCore 26800||Aukey 26800||RAVPower 26800||Which is Better?|
|RAVPower 26800 is the winner here due to its incredible price/performance/features. It is lightest and most compact while offering same battery capacity and nearly same total charging output amd that too at a much lower price than Anker 26800 Anker 26800's biggest plus is that it gets charged in 8 hrs but this still does not justify the high price Aukey PB Y15 is too bulky and with too low total output (3 amp) compared to the other two. Also even though it has USB-C output, it does nnot have USB PD support|
|Battery Capacity||26800 mAH||26500 mAh||26800 mAH||Anker & RavPower offer 4% more|
|Time to charge the powerbank||7-8 hrs using dual USB charger||16 hrs||16-17+ hrs using a 2 amp wall charger||Anker|
|Max Output||15 watt (3 amp) max per port 6 Amp max all ports||15 watt (3 amp) max per port 3 amp max all ports||12 watt (2.4 amp) max per port 5.5 Amp max all ports||Anker|
|Size||7 x 3.1 x 0.9 inches||7.9 x 3.78 x .9||6.77 x 0.79 x 3.15 inches||RAVPower|
Anker 26800 stands out from the two other in fast charging times (just 8 hrs) while Aukey PB Y15 and RAVPower 26800 take 16 hours+ to recharge. Other than this, its performance closely matches that of RAVPower 26800 in stability and charging performance.
Aukey PB Y15 25600 is 25% heavier and larger than RAVPower or Anker powerbanks. However, its biggest weak point is its maximum output of 3 amp. Anker (6 amp) and RAVPower (5.5 amp) offer much more. Large maximum output means that you can charge 2 or even 3 devices simultaneously at fast charging speeds (2.1 amp each for iPhone 7/6s and 2 to 3 amp each for most Androids etc.)
Considering all these factors, we will easily recommend RAVPower 26800
20000 Mah PowerBanks
20000 is a good weight and price point for users who want a big powerbank at reasonable price and weight. With 26800 mAH, you will get about 4 full charges for Galaxy S9, S8, or S7 or iPhone X and 6-7 full charges for iPhone 8 and 7/6S. We can classify 20000 mAH powerbanks in three main categories:
20000mAH with no USB PD or QuickCharge – These cost the lowest. Features to look for in these are two or more 2.4 amp ports for charging iPhones 7, 6, 5 etc at maximum supported speed and Android smartphones at good speeds (12 watt). The more is the total current output, the better and stable is the charging performance while you are charging multiple devices at once. Weight and bulk are also significant factors as well as the high capacity batteries can weigh well over 1 pound! Minimum 2-amp input charging is required to charge the powerbank in about 10-12 hrs.
20000 mAH with QuickCharge 3.0/2.0 – Minimum QC 2.0 (18 watt) fast charging compatibility is required as this is becoming the standard with latest Samsung smartphones such as S8, S9, S7, Note 8, Note 5 etc. support fastest charging at 18 watt (equal to QC 2.0). Another highly useful feature is QuickCharge input for charging the powerbank itself in about 4 hrs as otherwise it may take up to 24 hrs or more to charge a 20000 mAh powerbank with a 1 amp regular wall charger.
20000mAH with USB C Power Delivery (USB PD) – USB PD is set to become the charging standard of choice for 2018 and near future. Both Google Android and Apple (iPhone X, 8, and 8+ onwards) now support 18-watt fast charging over USB PD. Ideally a powerbank must have as much output in watts over USB PD as possible. For smartphones, minimum 18 watts is required for fast charging the Samsung/Apple smartphones as well as the Nintendo Switch. Higher PD output will be very useful for fast charging Macbooks and iPads. USB C PD input charging is also desirablgreatly useful for recharging the powerbank in 4 hrs.
Powerbanks with USB PD
|PowerCore Essential 20000 PD||Aukey 20000 PD||RAVpower 20000 45-watt PD||Which is Better?|
|Both RAVpower 20000 45-watt PD and Aukey 20000 PD offer better value for money with great quality for price. Both also come with USB-C, Lightning and micro-USB inputs. PowerCore Essential 20000 PD has best build quality of the three and is also the lightest It has just the USB-C input for charging the power bank|
|Price||RAVPower and Aukey|
|Max PD Output useful for charging Macbooks||18 watt||18 watt||18 watt||Same|
|Weight||12.4 oz (345 grams)||14 oz (390 grams)||14 oz (390 grams)||Anker|
|Time to charge the powerbank||6 hrs using USB PD charger||6 hrs using 18-watt USB PD charger||6 hrs using 18-watt USB PD charger||Same|
|Size||6.2 x 2.9 x 0.8 inches||7.9 x 3.1 x .9||7 x 0.91 x 3.1 inches||Anker is smallest and lightest|
|Battery Capacity||20000 mAH||20000 mAh||20000 mAH||Same|
RAVPower 20100 PD is the clear winner here, especially for charging Macbooks. For charging smartphones, all the three powerbanks are closely matched in features as well as charging performance (especially iPhone 11, 11 Pro, 11 Pro Max, XS, XR, XS, X, 8 which can be charged to 50% in 30 mins over USB-C PD). However, for charging Macbooks, Chromebooks, and Dell XPS 13/15, RAVPower 20100 PD has the clear edge due to its 45-watt output. It also comes with a USB-C to USB-C cable.
RAVPower 20100 PD is in fact a class of its own as it offers the far higher PD output of the three – 45 watt. This is extremely useful if you own a Macbook, iPad or a USB-C chargeable ultrabook or newer models of Dell XPS 13/15 (2016 and later) as these can be fast charged through the 45 watt USB PD port on the powerbank. It also gets charged slightly faster (4 hrs) than Aukey and as same speed as Anker.
Anker PowerCore Essential 20000 PD is the most light and compact of the three. If you need the most compact PD powerbank, Anker PowerCore Essential 20000 PD is a good choice. It is any day a better deal the Aukey PB Y20 as after adjusting for the wall charger it is priced same as PBY20 even though it has higher output (Anker has 24 watt vs Aukey’s 18 watt). PowerCore Speed 2000 PD also comes with a USB-C to USB-C cable that is easily worth about $10. You will need USB-C/USB-C cable to charge Android phones such as Pixels, S20, S10 etc.
That being said, if you already own a 30-watt USB PD wall charger and want the lowest-cost good quality fast charger for your iPhone 11, 11 Pro, 11 Pro Max, XR/XS, iPhone X, 8, 8+ or other latest Android smartphones than RAVPower 20100 PD is hands-down the best USB PD standalone power bank available.
Powerbanks with Fast Charging or Quickcharge 3.0
|Anker PowerCore II 20000||PowerCore 20000 QC 3.0||Aukey 20000 QC 3.0 + PD||RAVPower 20000 45-watt PD||Which is Better?|
|Both RAVpower 20000 45-watt PD and Aukey 20000 PD are better as the offer 18-watt USB-C PD in addition to Quickcharge 3.0. Both also get charged via USB-C port|
|Battery Capacity||20000 mAH||20000 mAH||20000 mAH||20100mAH||All same|
|Price||RAVPower & Aukey|
|Time to charge the powerbank||5 hrs using QC 2.0 wall charger||5 hrs with QC 3.0 charger||6.5 hrs using PD charger or QC charger||6.5 hrs using QC 3.0 or USB-C PD charger||All similar|
|Max PD or Quickcharge 3.0 Output||18 watt QC 2.0 QC 2 Best for Samsung S9, S8, S7||QC 3.0 18 watt Best for QC 3.0 phones||18 watt PD & 18 watt QC 3.0 Best for latest iPhones & QC 3.0 phones||18 watt PD & 18 watt QC 3.0 Best for latest iPhones & QC 3.0 phones||Aukey & RAVPower|
|Size||6.7 x 2.4 x .9 inches||6.7 x 2.4 x .9 inches||6.4 x 3.2 x .8 inches||6.8 x 3.19 x 0.87 inches||Anker|
The three powerbanks are very different and the best powerbank among these will depend on what smartphones you have and what features you need.
If you need fastest charging smartphones for Samsung smartphones S10, S9, S8, S7, Note 8 etc. then you do not need to buy the usually higher priced QC 3.0 powerbanks as Samsung phones till S10 series use 15 watt fast charge at max (equivalent to QC 2.0) and you can instead buy either RAVPower 20100 QC or Anker PowerCore II 20000 .
If you own a QuickCharge 3.0 smartphone such as the one listed here, then:
If you want to charge your phone the quickest and also charge the powerbank as fast as possible (in 4-5 hours), we recommend Anker PowerCore Speed 20000 or RAVPower 20100 QC . Both of these have QC 3.0 input feature for charging the powerbank using a QC 3.0 wall charger in 4-5 hrs. RAVPower 20100 QC also has an additional USB-C output as well as input feature that lets you recharge using a USb-C cable in 4 hrs. Aukey PB10 does not have QC 3.0 input.
Anker PowerCore Speed 20000 is easily the sleekest and most compact powerbank of the three. Aukey PB 10 is the bulkiest with RAVPower 20100 being between the two.
If you want the lowest cost QuickCharge 3.0 charger for your Quickcharge phone and are okay with the powerbank being charged in 12 hrs (using a 2 amp standard USB wall charger) than Aukey PB 10 is a good choice.
Powerbanks with 2.4 amp fast charging (no Quickcharge or USB PD)
|Anker PowerCore 20100||Aukey 20000||RAVPower 22000||Which is Better?|
| Both Anker 20100 and RAVPower 20800 are superb powerbanks with RAVPower 20800 being better package overall due to its attractive price. Anker PowerCore 20100 is slimmer and lighter than RAVPower 20800 but a bit overpriced.
RAVPower 20800 offers one more USB port & higher total charging current (5.5 amp)|
For charging maximum 2 devices at a time, we will pick Anker PowerCore 20100 for its low weight/sleekness
For heavy duty use for charging more than 2 devices at once, we will pick RAVPower 20800
|Max Output||4.8 Amp combined through 2 ports max 2.4 amp at one port||3.4 amp combined Max 2.4 per port||5.5 Amp combined through 3 ports max 2.4 amp at one port||RAVPower|
|Time to charge the powerbank||12 hrs+ using 2 amp wall charger||12 hrs with 2 amp charger||12hrs+ using 2 amp wall charger||Same|
|Size||6.5 x 2.3 x .9 inches||5.9 x 3.3 x .8 inch||6.81 x 3.19 x 0.91 inches||Anker|
|Battery Capacity||20000 mAH||20000 MAh||20800mAH||RAVPower|
These powerbanks are perfect as reasonably priced all purpose powerbanks with good charging speeds. The 12-watt maximum charging speed of these powerbanks suit all the iPhones and Androids. They will also charge iPhones 7, 7S, 6S, 5 etc. at highest possible speed. The only thing that these powerbanks lack are Quickcharge or “fast charge” features (for fast topping up of phones to 50% in 30 minutes) and fast input ( for recharging entire powerbank in 4 hours).
RAVPower Ace 22000 is the best deal among these three powerbanks. With three ports and 5.8 amp maximum combined output, it beats the other two fair and square. It also offers 10% extra battery capacity and weighs almost same as the others (14.4 oz or 408 gm).
Anker PowerCore 20000 is the lightest and most compact of the three and comes with the brand premium of Anker. It has two ports and max combined output of 4.8 amp – enough to fast charge two iphones at once.
Aukey is the lowest cost of the three but is also the bulkiest and heaviest. It also has the lowest combined output at 3.4 amp and is really suited for charging one device well. It also comes with a lightning input for recharging (2 amp or 12 hrs)). This makes it a good choice for very-low-cost & big capacity (but slightly bulky) powerbank companion for an iphone – though we will personally prefer a PowerCore 20100 for its dual fast charge capability and compactness or a RAVPower Ace 22000 for ist triple fast charge ports & relative compactness.
All of them will take about similar times (10 – 12 hrs) to recharge using a 2.4 amp wall charger.
10000mAH Power Banks
10000 mAH is the minimum reasonable powerbank size these days due to the ever-increasing power hungry nature of smartphones. A 10000 mAH powerbank will charge iPhones 8, 7, 6, 5s about three times. it will charge Samsung S8, S9, S7, Note 8 etc about 2+ times.
Features to look for
18-watt fast charging will be enable you to quickly top-up the phone when you are in a hurry. For example, QuickCharge 3.0 enables 80% charge in 30 minutes while fast charge (Quickcharge 2.0 equivalent) used by Samsung phones allows 50% charge in 30 minutes.
18-watt fast charging is the maximum supported by most Android smartphones such as Samsung S9, S8, S7, etc. Additionally, iPhones 7, 6, 5 etc. will also at their fastest speed (12 watt) with these powerbanks.
So, unless you own a Quickcharge 3.0 phone and absolutely need that 80% in 30 minute lightning quick top-up, 18-watt fast charging powerbanks are best value for money bet among 10000 mah powerbanks. Please note that for super-fast charging (50% in 30 minutes) of iPhone X, 8, and 8+, you will require USB PD powerbanks and there is currently no such powerbank in 10000 mah capacity. Therefore 18-watt fast charging or regular 12-watt powerbanks are currently your best option for iPhone X, 8, and 8+.
12 watt or 2.4 amp charging – 12 watt fast charging is next best thing after fast charging. The good thing is that almost all iPhones and Android phones support it. 12 watt charging powerbanks are not only inexpensive but allow you to extract maximum capacity from the small sized powerbanks such as 10000 mAH as they charge using lower voltage (5 volt) compared to 9 volts of quickcharge. This allows these powerbanks to extract more battery mAH than fast charging powerbanks
Weight/bulk – Portability and compactness/slimness is an important factor as often the best power bank is the one that you can carry around easily in your pocket, purse, or hand!
|RAVpower 20000 45-watt PD||RAVpower 20000 45-watt PD||RAVpower 10000 18-watt PD||Which is Better?|
|RAVpower 10000 18-watt PD offers best value for money with great quality for price. Aukey 10000 PD is the only one with USB-C, Lightning and micro-USB inputs. Anker 10000 Slim PDhas best build quality of the three and is also the lightest It has just the USB-C input for charging the power bank|
|Price||RAVPower and Aukey. Anker comes with a USB-C /USB-C cable easily worth $10|
|Max PD Output useful for charging Macbooks||18 watt||18 watt||18 watt||Same|
|Weight||7.5 oz (210 grams)||8.2 oz (230 grams)||7.2 oz (200 grams)||Anker/RAVPower|
|Time to charge the powerbank||4.5 hrs using USB PD charger||4.5 hrs using 18-watt USB PD charger||4.5 hrs using 18-watt USB PD charger||Same|
|Size||5.89 x 2.70 x 0.57 inches||4.21 x 2.72 x 0.94 inches||5.5 x 0.5 x 2.6 inches||Anker is smallest and lightest|
|Battery Capacity||10000 mAH||10000 mAh||10000 mAH||Same|
18-watt fast charging Powerbanks for Samsung S10, S9, S8, S7 and Iphone 8, 7,6,5
Anker PowerCore II 10000 and RAVPower 10000 QC 3.0 are our top picks as 18-watt fast charging powerbanks for Samsung S9, S8, S7, series phones as well as other Android smartphones that support 18-watt fast charge.
Anker PowerCore II 10000 is the lightest and most compact of the three while RAVPower 10000 QC 3.0 is the slimmest and most pocketable at .6 inches. Aukey PB-T14 is thickest (.8 inches) and the heaviest. RAVPower 10000 QC 3.0 is also currently available at the lowest price among the three powerbanks.
If you have a Samsung phone, we recommend either Anker PowerCore II 10000 or the RAVPower 10000 QC 3.0.
If you have a Quickcharge 3.0 phone, (see the section below) we recommend RAVPower 10000 QC 3.0 due to its Quickcharge 3.0 Input/Output support and slim pocketable profile and light weight (7 oz).
All these powerbanks will get charged in about 5 hrs using a Quickcharge 3.0 wall charger.
Quickcharge 3.0 Powerbanks for smartphones with QuickCharge 3.0
|Anker PowerCore II Slim 10000||PowerCore Speed 10000 QC 3.0||Aukey 10000 USB-C PD + QC 3.0||RAVPower 10000 QC 3.0||Which is Better?|
|Aukey 10000 USB-C is best as it offer QC 3.0 + USB-C PD and USB-C charging.|
|Battery Capacity||10000 mAH||10000||10000||10000||Same|
|Price||Aukey & RAVPower|
|Quickcharge Support||QC 2.0 input/output support - for charging at the the max speed supported by Samsung S8, S9. Will charge S9/S8/S7 to 50% in 30 mins. 4 hrs to charge the powrbank||QC 3.0 Output only for 80% charge in 30 mins||Both QC 3.0 & USB-C PD support||Both QC 3.0 Input (for charging powerbank in 4 hrs) & Output (for charging QC phones in about 1.5 hrs)||Anker PowerCore Speed QC has fastest 24-watt QuickCharge 3.0. All else offer 18-watt|
|Size||2.6 x 5.39 x 0.61 in||3.9 x 2.4 x 0.9in||4.2” x 2.3” x 0.9”||5.12 x 2.2 x 0.94 inches||Anker|
RAVPower 10000 QC 3.0 is our top pick as a Quickcharge 3.0 powerbank as it is very slim, light , robust, very well priced and also delivers stable charging performance with true 10000 mAH capacity.
While Anker PowerCore 10000 Speed is a great powerbank, we believe it is way overpriced at the moment. We do not recommend Aukey PB-T14 and PB-T18 due to reliability concerns.
12 watt (2.4 amp) charging power banks
|Anker PowerCore 10000||Aukey 10000 USB-C||RAVPower 10000||Which is Better?|
| Anker PowerCore 10000 is the most compact and light. 10000 mah powerbank. RAVPower 10000 is best for charging two phones at once . |
Aukey 10000 USB-C can be charged via USB-C port or micro-USB and is best option for the money.
|Battery Capacity||10000 mAH||10000 mAH||10000mAH||Same|
|Price||Aukey & RAVPower|
|Max Charging Output||2.4 amp (1 port)|| 3 amp from USB-C port |
2.4 amp from USB port
|3.4 amp total Max 2.4 amp per port (2 ports)|| RAVPower can charge 2 phones at once|
Aukey outputs 3-amp from USB-C port
|Size||3.6 x 2.3 x 0.9 inches||4.6 x 2.9 x .63||5.12 x 2.2 x 0.94 inches||Anker|
Anker PowerCore 10000 is our top pick as ultralight 10000 mAH 12-watt/2.4 amp powerbank. It is simply the lightest, most compact and reliable powerbank of the three. No other non-Quickcharge 10000 mah powerbank provides a comparable combination of compactness and reliability.
The only “problem” with Anker Powercore 10000 is that you can get the excellent, slim, 18-watt fast-charging QuickCharge 3.0 compatible RAVPower 10000 QC 3.0 at almost the same or lower price!
If your budget requires as low price as possible and you do not mind the extra 2.5 oz weight and larger size than PowerCore 10000, then RAVPower 10000 (the version without QC 3.0) is the best choice.