As a father with 4 children and a family that likes to travel, having available power is a must. Prior to a few years ago, this meant carrying wall chargers and cables, and hopefully finding tables by outlets when on an urban vacation, or just dealing if away from civilization. Thankfully the ready availability of back-up batteries with USB outputs have made this a thing of the past. Now the challenge is finding one that's reliable and has capacity to keep up with today's high demand devices. Luckily there's Anker.
I first picked up the 20100 about 2 years ago, so it's not the newest product on the market, but it is one of the most affordable and reliable. It's also been revised several times as new technology is available, so it will keep up with todays devices. There's even a USB-C version now, though that's a review for another time.
First impressions, this is solid. Out of the box it has a nice heft and is well put together. No loose rattle or clicks. Button is smooth and responsive. Seams clean/tight and has a durable feel to the entire unit. Looks and feels well made. It's also held up well. In the two years since I purchased it, it's been annexed by teenage son. It's survived several drops, and daily being thrown in his backpack. It's not marketed as "rugged" but it has held up excellently to daily use/abuse. It is a little larger than most battery packs, but this is to be expected at a capacity of 20,100 mAh. Lithium cells can only get so small, but the unit is still very compact consider it barely larger than the six 18650 cells that power it. It won't fit in your pocket, but easily slips in a purse or backpack.
Performance has been excellent. Capacity is listed at 20,100 mAh but you need to keep in mind there is a conversion you need to do prior to matching to your phone capacity. For example, Anker states it will charge the iPhone 6s a total of 7.3x. iPhone 6s battery is 1715mah. 1715x7.3 = 12,520. Well below 20,100 mAh. But you are converting from a 3.7volt cell in the backup battery to 5V USB output. Then your phone is converting the 5V coming in typically back down to 4.2V. With these conversions you will have losses due to inefficiency, which is why your battery and phone heat up with use.
So, where does the 20100 fall? I hooked my unit up to a dummy load running 5v at 2A, using a smart multimeter, I consistently measured capacity at 13,640 mAh. Converting to watt hours (makes for easier comparison) = 68.2 Watt hours. Anker lists the battery pack at 74.37 Watt hours. 68.2/74.37 = 92% available capacity. Accounting for losses due to electric resistance and conversion, this is excellent efficiency. It also accounts for why the battery doesn't really heat up with use.
So real world use? iPhone 6 can recharge about 7.5 times. iPhone 7 about 7 times. When I tested with my iphone 7 I can typically get 6.8 charges before the battery pack is completely drained. So the advertised capacity is essentially dead on.
Charging, as other reviewers have noted, takes awhile. With a 2A charger this takes about 9-10 hours if the unit is completely dead. Since most people are not going to drain the pack daily, plug in at bedtime and it's ready in the morning. If you're using your phone charger it will take longer, but honestly if you're investing in this battery pack, do yourself a favor and pick up a quality wall charger (Anker sells several versions of those also :) ) When I used this on our last trip to Disney, it charged on average 3-4 phones/day and still had 2 leds lit. Plugged it in at night and it was full and ready to go by morning. Another very important feature is the dual USB outputs. Being able to charge 2 phones and stop siblings from fighting over the charger is priceless.
In all, this is a phenomenal battery pack and a steal at the current price. Catch it during a sale or with a discount coupon and it's a no brainer.
If you need a high capacity battery and don't need to worry about it fitting in a pocket, you can't go wrong with the Anker 20100.
I purchased this with my own money, did not receive any discount or incentives and was not asked by the company to write this review.
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Carbon emissions from the lifecycle of this product were measured, reduced and offset.
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Certification Number
743M8T Part of
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This Item  Anker 20,100mAh Portable Charger, Ultra High Capacity Power Bank with 4.8A Output and PowerIQ Technology, External Battery Pack for iPhone 15/15 Plus/15 Pro/15 Pro Max, iPad, Samsung Galaxy, and More |  |  |  |  |  | |
| Price | $49.99 | $31.99 | $39.99 | $25.99 | -9% $31.99 List: $34.99 | -13% $69.99 Typical: $79.99 |
| Delivery | Get it as soon as Tuesday, Jun 4 | Get it as soon as Wednesday, Jun 5 | Get it as soon as Tuesday, Jun 4 | Get it as soon as Tuesday, Jun 4 | Get it as soon as Tuesday, Jun 4 | Get it as soon as Tuesday, Jun 4 |
| Customer Ratings | ||||||
| For traveling | ||||||
| Charging power | ||||||
| Battery life | ||||||
| Value for money | ||||||
| Sold By | AnkerDirect | AnkerDirect | AnkerDirect | AnkerDirect | AlphaDailyDeals | AnkerDirect |
| capacity | — | 20000 milliamp hours | 20000 milliamp hours | 10000 milliamp hours | 5000 milliamp hours | — |
| connector type | USB Type A, Micro USB | USB Type C | Built-in C Cable + 1C1A | USB Type C | USB-C*2+USB-A*1 | USB Type C |
| number of ports | 2 | 2 | 3 | 2 | 3 | 2 |
| compatible devices | Smartphone | iPhone 15/15 Pro /15 Pro Max/14/14 Pro, Samsung, iPad Pro, and More | iPhone 15/15 Plus/15 Pro/15 Pro Max, iPhone 14/13 Series, MacBook, Galaxy | iPhone 15/15 Plus/15 Pro/15 Pro Max/14/14 Pro/Samsung/Pixel/LG | Ipad | Tablet, MacBook, iPhone iPhone 15/15 Plus/15 Pro/15 Pro Max, iPhone14/13/12 series, Samsung Galaxy, iPad, and More |
| voltage | 5 volts | 5 volts | 5 volts | 5 volts | 5 volts | 5 volts |
| battery charge time | 10 hours | 24 hours | — | 24 hours | — | 28 minutes |
| weight | 0.78 pounds | 465 grams | 0.76 pounds | 250 grams | 0.49 pounds | 2 pounds |
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Customer Review: Excellent 20000mah Power Bank!
Galaxy Tech Review
From the brand
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We want you to live without the inconvenience and uncertainty of where your next charge is coming from.
Our chargers and accessories don't just power up your devices, they offer the tech experience you want with zero restrictions.
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From the manufacturer
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Perfectly PortableLighter than a can of soup, PowerCore fits easily inside backpacks, purses, or computer bags. |
High-Speed ChargingAnker’s world-renowned PowerIQ and VoltageBoost combine to deliver a high-speed charge to a wide range of devices. |
Highly DurableConstructed with premium materials to keep you charging again and again. |
Universal CompatibilityDesigned for use with virtually any device that charges from a USB port. |
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| PowerCore 20100 | PowerCore 10000 | PowerCore 26800 | PowerCore Essential 20000 PD | PowerCore+ 26800 PD | |
| Customer Reviews |
46,870
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66,287
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37,137
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6,140
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2,512
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| Price | $49.99 | $25.98 | $59.99 | $54.99 | $99.99 |
| Series | Basic | Basic | Basic | Premium | Premium |
| Main Feature | Light Weight | Portable /Light | Triple Device Charging | PD+PIQ2.0 Quick Charge | Macbook Air Supported |
| Extra Hours of Battery Life (based on current average smartphone batteries) | +92 Hours | +46 Hours | +123 Hours | +92 Hours | +123 Hours |
| Output Ports | 2 x USB-A | 1xUSB-A | 3 x USB-A | 1 x USB-C 1 x USB-A | 1 x USB-C 2 x USB-A |
| Recharging Time | 10 Hours | ~4.7Hours | 6.5 Hours (using both input ports) | 6.5 Hours (using USB-C to USB-C PD Charger) | 4.5 Hours (using USB-C to USB-C PD Charger) |
| Size | 6.6 x 2.4 x 0.9 in | 3.6 x 2.3 x 0.9 in | 7 x 3.1 x 0.9 in | 6.2 x 2.9 x 0.8 in | 7.1 x 3.1 x 0.9 in |
| Weight | 356g/12.56oz | 180g/6.35oz | 490g/17.28oz | 345.5g /12.2oz | 576g/20.3oz |
Sustainability features
This product has sustainability features recognized by trusted certifications.
Carbon impact
Carbon emissions from the lifecycle of this product were measured, reduced and offset.
As certified by
Climate neutral by ClimatePartner The Climate neutral label by ClimatePartner certifies that the carbon footprint of a product was calculated and all associated emissions were offset. Additionally, ClimatePartner encourages companies to set ambitious reduction targets and reduce their products' carbon footprints. The certificate number can be entered on ClimatePartner’s website for additional information such as the supported carbon offset project(s). ClimatePartner is improving lives by helping companies tackle climate change with practical solutions.
Certification Number
743M8T Part of
Reviews with images
I’ve had this power bank since 2015
I was considering upgrading my Anker power bank to something newer or nicer but this thing has kept working since then! Sure it takes a while to charge the actual power bank and it still uses micro-usb but it works!
Top reviews from other countries
Josh Levinson
Excellent portable charger when Quickcharge and travelling ultra light are not important
Reviewed in Canada on June 22, 2016
Josh Levinson
Reviewed in Canada on June 22, 2016
PACKAGING: I’m not usually one to care about how a product is packaged (as long it isn’t damaged in transit) - but I have to say, Anker has done a superb job packaging this thing. Maybe not quite at the Apple level, but not too far from it. As soon as you open the box, you get the impression this is a premium product.
BUILD QUALITY: I’m extremely impressed with the build quality of this product, especially given its very reasonable (dare I say low) price. It feels very dense and solid, while not being unreasonably heavy. At 358 g + 10 g (pouch) + 14 g (cable), this may be getting a bit heavy for hiking/backpacking trips, but is quite lightweight for just about anything else (car/plane travel, car camping, etc.). Speaking of the pouch, this is probably the best soft carrying pouch I’ve ever seen included with an electronics product. It’s made of a nice lightweight mesh, which is lined internally with a thin foam padding that gives added protection against bumps and drops. The USB A ports seem to be of really nice quality, and have a great feel to them when you insert a USB plug into them. This model has two USB ports, allowing charging of 2 devices (at up to 2.4A each) simultaneously - this is a very nice feature to save time when multiple devices need to be charged. The device has a small 4-light LED indicator that provides information on the current charge level, which is very useful for knowing how much juice is left in the battery pack. While not charging or being charged, pressing a small button on the side of the device will activate the LED indicator. The only minor complaint I have is that plugging a cable into the micro USB port is a little more resistant and finicky than I’d like.
CHARGING: When using this device to charge my Samsung Galaxy S7 Edge (3600 mAh battery), I get an average charging rate of about 1.3 minutes per % (so about 130 min. to fully charge the phone). This rate is similar to what I get from standard (non-fast charge) 2A wall chargers. The PowerCore has the capacity to fully charge the phone just under 4 times, which is expected given the 60-70% efficiency quoted by Anker on their website. In terms of how long it takes to recharge the PowerCore itself, it takes about 11.5 hours to go from empty to full (using a 2A USB charger). One nice feature to point out is that there is no on/off switch - when you plug in a device, it starts charging, and when you unplug it, it stops. So no need to worry about forgetting to turn the charger on or off.
PROS:
- Very well built, and seemingly durable
- Reasonable weight, given the charge capacity
- Good length micro USB cable and excellent quality carrying/storage pouch included
- Charge level indicator
- Charges devices at a good rate
- Does not need to be switched on/off
CONS:
- Time to recharge the PowerCore 20100 is somewhat on the long side, making things a bit tricky. For example, if you wanted to charge overnight, you’d need to start it charging a couple of hours before going to bed, and leave it charging for a couple more hours after waking up - this is a bit awkward.
CONCLUSION: Overall, I’m very impressed with this product. It appears to be a high quality product that offers a great set of features. No, it doesn’t have Quickcharge capability (either for charging or for being charged), but given its low price, it offers excellent value. Unless Quickcharge is important to you, I would highly recommend this battery pack to people looking for a super convenient way to charge their electronic devices while travelling.
PICTURES: Among the attached pictures, I’ve included one of the PowerCore 20100 beside a credit card, and another of it beside the PowerCore 10000, to give a relative sense of size.
Images in this review
Mike Cheng
One of The Best Portable Chargers, EVER!
Reviewed in Canada on April 14, 2016