When traveling long distance it's always handy having extra phone battery without having to plug your phone into a wall electrical socket using a multiport wall charger. Extra charge is particularly useful  if you're a heavy phone user or want to help others charge their phones.
If your smartphone doesn't hold charge for very long carrying a powerbank is certainly the best way to extend the life of your phone!
Of course, all powerbanks are not created equal so it's worth looking for a fast charging power bank like the upgraded version of the Anker PowerCore Speed 20000 that can increase your recharge speed charging capacity.
To give you an idea of how much storage capacity the PowerCore Speed's 20000mAh battery holds, it can recharge a Samsung Galaxy Note 8 phone three times over, an Amazon Kindle e-reader three times over and an LG G7 phone two times over.
The Anker PowerCore Speed 20000 has a grip, ergonomic finish that makes holding it in the hand comfortable. The power button has an led clock-like design that shows the battery level per led.
While the Anker PowerCore Speed 20000 is heavier and bulkier (369 grams) than the PowerCore II 10,000mAh powerbank,  the PowerCore Speed 20000 does provide twice the battery storage as well as a 12W (5V/2.4A) output port and an 18W PowerIQ 2.0 output port that supports Qualcomm 3.0 quick charge (5-8V/3A, 8-10V/2.4A and 10-12V/2A) port so you can charge two devices at the same time.
Having a Qualcomm quick charge port is neat but keep in mind that non quick charge compatible devices will charge at normal speed via the Qualcomm quick charge port. The PowerCore Speed 20000 measures 17cm, 6.2cm wide and 2.2cm thick.
 It's also worth keeping in mind whether your phone supports Qualcomm quick charge because the Anker PowerCore Speed 20000 does not provide fast charging for the Zenfone 3 (ZE552KL).
 Many people believe the Zenfone 3 supports Qualcomm quick charge when in fact the Zenfone 3 does not support Qualcomm quick charge even though its chipset supports it. The deluxe version, Zenfone 3 Deluxe does support Qualcomm quick charge.
Neither the Nexus 6P and Nexus 5X support fast charging standard, so you won't get fast recharging speeds using the Anker PowerCore Speed 20000. Both the Nexus 6P and Nexus 5X use the new USB-C standard to charge at a rate of 15W (equivalent to 5V x 3A). Also, keep in mind that the Anker PowerCore Speed 20000 does nor provide charge for low input devices below 50mA.
The upgraded version of the Anker PowerCore Speed 20000 uses a 18W PowerIQ input port that supports Quick Charge 3.0 (5V/ 2A, 9V/2A and 12V/1.5A) as opposed to the 30W Power Delivery input/output fitted to the standard PowerCore Speed 20000 that makes charging and recharging  extremely fast (only 4 hours to recharge when using a 30W wall charger).
The upgraded version of the PowerCore Speed 20000 takes 6 hours to recharge and also gains an extra USB-A output.
Bear in mind though, that you have to use a quick-charge compatible wall charger with the upgraded version of the Anker PowerCore Speed 20000 otherwise recharging the powerbank takes 10 hours.

While most power banks accomplish the same objective, some power banks such as the PowerCore Plus 26800 do it breathtakingly fast via three super fast charging ports, one of which is a USB-C Power Delivery (PD) port capable of outputting 45 watts of power.
USB-C ports with Power Delivery are capable of outputting up to 100 watts, although with that much power you need a specific USB Type C cable with a marker chip to handle the power. These types of cables are called Electronically Marked Cable Assembly (EMCA), which are "active cables".
The USB Type C cable that is included with the Anker PowerCore Plus 26800 is "passive" as it has no electronics in it. Being a passive cable, the Anker USB C charging cable can safely deliver up to 45-watts, which is enough power to charge a HP Stream Series laptop or Dell Inspiron Series laptop at full speed.
The Anker PowerCore Plus 26800 is able to deliver 45 watts at two different rates to suit a range of laptops, including 15-volt/3-amp for laptops such as the Toshiba Satellite Radius, HP Elitebook and the 13-inch MacBook Pro. The PowerCore Plus can also output 20-volt/2.25-amp, which is needed for laptops such as the Lenovo ThinkPad Helix and Dell XPS 13.
The Anker PowerCore Plus 26800 powerbank can also charge higher wattage laptops, although at lower speeds. For less power hungry devices like tablets and phones, the Anker PowerCore+ also comes equipped with two USB-A ports that can output 15 watts (5-volt/3-amp) each. When both USB-A ports are used at the same time, the current drops to 2.4-amp per port.
The Anker PowerCore Plus USB-C Power Delivery port has dual functionality too. It is also a power input port designed to recharge the power bank, which is done at different variable rates, including 5-volt/3-amp, 9-volt/3-amp, 15-volt/3-amp and 20-volt/2.25-amp. The USB-C port is set to input charge by default. To enable output charge to recharge external devices, the power button wheel has to be pressed once before inserting the USB-C charging cable.
In terms of charging performance, the Anker PowerCore Plus has a blazing fast charging performance that is much faster than any other USB-C power banks, including the PowerCore Lite, PowerCore and the PowerCore Speed upgraded version, all of which can only output a maximum of 12 volts, whereas the PowerCore Plus can output a maximum of 20 volts.
The Anker PowerCore Plus 26800 is truly a mammoth of a powerhouse but, all that power can only be achieved via a high output power adapter, which is conveniently included in the box. It is an Anker branded GaN power adapter (PowerPort Atom 3) that can fully recharge the PowerCore Plus power bank from 0% to 100% in just 3.5 hours. While the PowerCore Plus is recharging is not able to output charge.
The PowerPort Atom 3 can deliver a massive 60 watts of power in a small footprint, thanks to the use of Gallium nitride (GaN), which is the same technology used in the 30-watt PowerPort Atom 1. The PowerPort Atom 3 has the same sleak, high gloss design as the Atom 1 but, the Atom 3 is twice as heavy (125 grams) and twice as powerful (60 watts).
In terms of build quality, the PowerCore Plus 26800 PD housing is constructed solidly with metal casing, weighing 590 grams and, measuring 18cm long, 8cm wide and 23m thick. The PowerCore Plus design is minimalist with just  three connectivity ports and a power button located on the front.
The power button has a wheel design with ten tiny white leds doted around like an analog clock, each representing 10% of charge, which allows better management of low battery power. Most power banks typically have four battery led indicators, which is not as accurate to determinate how much charge there is left. The led located at 12 o'clock can also light up green color to indicate trickle-charging mode, which is enabled by holding down the power button.
Trickle charging mode, essentially, reduces the output charge for charging low mAh capacity gadgets such as headphones. While it maybe tempting to use full power for faster charging, there are a couple of reasons you actually don't want to be using this amount of power to recharge low power devices.
The first reason is that you can damage a device if it isn't equipped with an over-voltage protection. The second reason is shorter battery lifespan because, it is no secret fast charging decreases battery performance. You definitely don't want to charge a phone regularly via the PowerCore Plus 45W Power Delivery port, unless it is for emergency situations when you need to power up your phone real fast.
 Most power banks don't actually include the rated capacity anywhere on the product listing, not even on the power bank itself. Anker has included the rated capacity on the base of the power bank, which is handy to know if you want to learn the true charge capacity of a power bank. The Anker PowerCore Plus integrates eight batteries (3350 mAh each)so, the powerbank has a total 26,800 mAh cell capacity. 
The stated rated capacity is 6,700mAh, which seems a bit off since it should be close to 19832mAh. This is because power banks experience a power loss during the voltage conversion from 3.7 volt to 5 volt. The rated capacity rating tells you how much power the power bank can actually deliver

With a design reminiscent of a UFO mothership, the Anker PowerConf is a useful tool for a business or home office setup where Skype group meetings are part of the schedule!
The Anker PowerConf has a 5.5-inch square body and blends well in any environment, thanks to its professional-looking, space grey design.
Aside from having the Anker PowerConf connected to a mobile via bluetooth, you can also connect it to a desktop computer via the USB-C port, which also doubles as the charging port.When the PowerConf is connected to a computer though, you cannot have it connected to a phone at the same time.
Since the PowerConf can be set up as a Bluetooth speaker and microphone, the Anker PowerConf works well for various setups, including WhatsApp conference call, Facebook Live and conference calls, using a phone handset rather than an app.
The Anker PowerConf supports audio output too, which means you can connect the PowerConf to a more powerful external speaker via aux cable connection. When connected to an external speaker, the PowerConf internal speaker gets disabled automatically. Having the option to hook up the PowerConf to an external speaker is useful for improving the bass response since the PowerConf 3-watt speaker has been tuned to favor the vocal, upper mid-range frequencies.
There are a total of six microphones built-in to the PowerConf that are spread across the aluminium mid-frame ring of the speaker. The microphone array provides a 360 degree pick-up that is perfect for round-table or group conference calls. The microphones have noise cancellation but, instead of, using ANC technology, the PowerConf speaker uses a DSP noise reduction algorithm to improve the sound quality of the microphone.

The PowerConf microphones are not designed to cancel noise like ANC noise cancellation does; hence noise cancellation is exclusively done by the DSP chip, which does a good job at removing noise, echo and distortions from the voice signal without degrading the voice quality and amplification, which is good up to 5 meters. That said, the further away you move from the PowerConf the quieter your voice will sound.
While DSP noise reduction works, it's not as accurate as the ANC noise cancellation in a pair of headphones, like the Soundcore Life 2, which uses the outside input of a microphone(s) to get a full on noise cancellation effect. Another advantage of ANC noise cancellation is that it can be turned off manually by the user; whereas DSP noise reduction cannot be turned off, which could help improve battery life.
The internal 6700mAh battery inside the PowerConf recharges via 5V/2A input charge and can be used just like an Anker powerbank to output 5V/2.1 charge for recharging external devices via the USB port located on the rear of the unit, next to the AUX OUT and USB-C power port.
The USB-port cannot be used for charging the PowerConf and, it will only work when the PowerConf speaker it turned on.
The USB port has also been programmed to output power charge according to battery level. When battery is less than 30%, the USB port automatically lowers the output current from 2.1A to 1A.
When battery level is less than 10%, the USB port will not output charge so, you will not be able to charge any devices. Charging the Anker PowerConf takes 4 hours and you get up to 24 hours of call time and up to 19 hours of music playtime when playing audio at 50% volume.
The top and bottom halves of the PowerConf speaker are made of smooth, hard plastic. The top section has perforated holes in a radiated pattern, which double as the grille, concealing the 3W speaker driver. If you need more output power, check out the newer version - the PowerConf S500 with 10W speaker.
In the centre of the unit, there is a large status led ring with five capacitive-touch buttons, including independent volume controls (volume up and volume down), mute button, play/pause button and answer/end call button. With the answer/end call button, you can also reject a call (by holding the button for 2 seconds).
The PowerConf connects to a phone via Bluetooth 5.0 connection, which supports up to 10 meters of range; hence you can keep the phone far away from the PowerConf. When you receive an incoming call, the status led ring breathes green. When adjusting the volume, the status led ring will also light up blue in a clockwise and counter-clockwise fashion.
The status led also feedbacks the muting of sound and battery level. When sound is muted, the status led turns red. The led will also light up green when checking the battery. Battery level is checked by pressing the power button, which is located on the front of the unit, next to the bluetooth button. When battery is low, the led flashes red.
Both the power button and bluetooth button are raised buttons with mechanical switches, while the capacitive touch buttons on top are flat.
After powering off the unit, whichever device the PowerConf is paired to last, it will automatically reconnect. Also, after 30 minutes of inactivity, PowerConf will automatically turn off to conserve battery power. The bottom section of the PowerConf is sealed shut and features a large and thick round rubber feet, which provides excellent stability and anti-skid support.
A long USB-A to USB-C charging cable is included alongside a snazzy hard-shell zip case for transporting the 340-gram PowerConf. The hard-shell case is Anker-branded and made with a water resistant outer shell and lined with soft felt fabric to prevent scratches.
The zip case features also a long webbing loop on the side that would allow you to loop it onto a wrist, clip it or hook it onto something. You can buy the Anker PowerConf speakerphone on amazon. Check out the review of the PowerConf H700 conference call headset.