[General Accessories] muzicman82:
This is a review of the Anker Astro Mini 3200mAh External Battery. The product's official page can be found here. It is for sale in the US on Amazon.com and is currently $19.99 with a list price of $39.99.

Before I get started, I was provided a sample by Anker and asked to give my unbiased thoughts on the product. You should know that I absolutely love Anker products, but that does not mean I am going to love everything they make.

I also own 3x of the Anker E5 16000mAh External Batteries, their E1 5200mAh External Battery, and some of their other 5x and 2x port USB wall chargers. I have also owned external batteries from other manufacturer's as well.

For my testing, I tested throughout the week with my Samsung Galaxy S 4 phone with the stock OEM battery. I currently have OmniROM Nightlies on it, and while it is good on battery life, stock ROMs may have different results.

The product box is a cute 4.25"x4.5"x2.5" cube. As with most if not all Anker products, the box is lightweight cardboard with a paper slip cover.

Some other unboxing and size comparison photos below:

As with most Anker products I have unboxed, the feeling I get with their products even before using the actual product is that the packaging is very well designed and thought out. Their graphics design team has a great eye for presenting their product with integrity. I really enjoy the documentation they include, which includes a simple card with contact/support info if you aren't happy with the product, as well as social media links suggesting you follow them and review their product on Amazon. With tons of similar products on the market, it is often these little things that keep consumers (including me) coming back for more. In fact, if you read the product features, one of them is "friendly customer service". The warranty on this product is 18 months, which is great for such an inexpensive battery.

The unit feels very well made. It doesn't feel like there is any wasted space. I was provided a gold colored sample and print is all white, which is hard to read. I can't tell if the print is laser etched or a light silk screen. That said, it is probably more attractive than big, bold black text on the unit. At 80g / 2.8oz, this thing is light!

The included mesh bag is similar to those that other Anker products include, but it measures 5"x2.5", which seems large on this tiny battery. It looks like this bag was designed for another product but included with this one. In fact, it appears to be the perfect size and shape for my Anker E1 5200 mAh battery that didn't include a mesh bag. These bags are great because it gives you a way to store the cable with the battery without leaving the cable plugged in, potentially damaging the cable and port while in your bag or pocket. The included cable is white and is approximately 28" in length. One thought I had is that if this battery is marketed to iPhone and Android users alike, why is only a micro USB cable included? Granted, it is certainly cheaper than an Apple Lightning cable, but keep in mind that the product page only shows an iPhone with a cable plugged in, so that could be misleading.

I generally use external batteries of at least 5,000 mAh. Given the Galaxy S 4 internal battery is 2600mAh, if I'm on the go for a day and really active on the phone using GPS, Internet, music, etc, I'm always afraid these little chargers aren't going to last me very long. That said I put this in my pocket for the day and made myself use it exclusively. The first time I used it, I'll admit, I did not charge it first. I wanted to see how it would behave and how I would react to not knowing how much charge was left in it. The unit has one LED and one button. There is no gauge for capacity remaining other than the LED will flash twice if the charge is less than 2%. Not much of a warning here. So on the first discharge from the unit, I got about 45 minutes until the battery just shut off. And that was it... as expected. With other batteries that feature gauges, there is often a 4-5 segment meter indicating percentage ranges of capacity left. This is a feature that is hugely missing from this little 3200mAh charger, but given it's compact size, it is completely understandable. On this battery, once you plug in your device, you do need to press the button on the battery to turn it on and begin charging. An auto-current detect would be nice so you don't forget to press the power button and end up not charging at all.

I charged the unit using the Anker 20W Dual USB Wall Charger. I first attempted the charge through a PLX Devices Legion USB Meter to measure the charge current. This will vary between wall chargers and even the current draw from the battery. I tried this with the Anker charger and my Samsung Galaxy S 4 OEM Charger (2A) and got the same 0.85A-0.90A charge rate. The documentation says input current is 0.8A max, so getting 0.9A is a nice surprise. At 0.8A charge, and if the battery was drained to 3,000mA, we can expect a full charge to take approximately 4.5 hours.

After my first full charge, I measured charge current output to other devices. I charged my Galaxy S 4 with 50% battery left, and also tried charging an Anker E5 16000 mAh battery just for kicks. On the Legion Meter, I saw anywhere from 0.6A to 0.97A.

The specifications for this battery state it is capable of 1A max charge. This is where we get into the question, "Is this product right for my device?" It does have Anker's PowerIQ technology with claims to deliver the most efficient charge for your device. That said, my Galaxy S 4 ships with a 2A charger, and I can verify that it WILL charge at up to 2A. So, comparing this battery with a wall charger just isn't fair because, it won't charge your device nearly as fast. I noticed this while using it throughout the week too. If the phone is under heavy CPU load, the phone very well may drain faster than it can charge. However, I during testing I used the phone moderately and can say that the phone DID reach 100% charge without a problem.

Browsing Amazon.com, I noticed that RAVPower has a nearly identical device with almost the exact size, color options, and features. The differences I noticed include the RAVPower has a flashlight on the end, the warranty is only 12 months, and a travel pouch is not listed as included. The RAVPower unit is also $17.99 at the time of this writing. That said, I do not know if Anker and RAVPower are in any way affiliated with each other since these are nearly the same, and even their websites look nearly identical. Both only sell on Amazon as well. The Anker model is available in other countries whereas the RAVPower seems only available in the USA.

I know some consumers would prefer this "lipstick" style charger. It will fit nearly anywhere. However, I do not see the appeal other than size, shape, and color to choose this over the Astro E1 battery, which has 60% more capacity, a 4-segment LED showing capacity remaining, and charges at 2A current instead of only 1A. Both are currently $19.99 on Amazon.com as of this writing. If you want functionality, I'd go with the Astro E1. If you need tiny or a colorful unit, perhaps this 3200 mAh lipstick battery is for you.

I will continue to use this battery as another backup, and even hand it off to my girlfriend for some thoughts. I'll update this post with new information as I gather it. If anyone has any questions, please don't hesitate to ask.