This may very well be the worst and the ugliest official iPhone 6s battery case Apple has ever released. Why is it so bad? Just look at it. It features a 1877 mAh battery that sticks out like Mt. Kilimanjaro. It makes it look like your iPhone ate an iPod. It looks like your iPhone has cancer-- it looks bad. But it gets worse. First of all, the battery indicator light is on the inside of the case. So if you happen to be using it as intended by having your iPhone inside the case, you won't be able to see the indicator light. Instead, you'll have to check the battery level of the case when it's installed on your iPhone by navigating into the settings or by viewing the lock screen and on your notification panel.
If you want to use up the majority of your iPhone battery before you use the external battery, tough luck. There's no switch to disable the battery case so energy will always be flowing to your iPhone from the case whether you like it or not. The battery itself is a 1877 mAh battery which is a tad bigger than the 1715 mAh battery inside the 6s. That means, in theory, you can charge your iPhone 6s from empty to 100% and still have battery power remaining but that is still not the case. I wasn't able to fully charge a fully drained battery with this case.
It's also worth mentioning Apple released two colored cases-- a white and a space gray color variant. Obviously, I have the space gray variant because the white one is just much more prone to visible damage or dirt. The rubber top of the case also picks up some felt when in your pocket. And it's much more visible on the white variant than it is on the gray variant. Arguably, the least most attractive feature of this case is the price. It costs $99, which is outrageously expensive given the cons I mentioned earlier.
The battery case isn't all bad but the cons certainly outweigh the pros in my personal opinion. For example, the inside of the case does feature a nice felt-like material that is soft to the touch and we have a nice lightning connector to power the case, which is a little bit unheard of for a battery case that usually feature a micro USB port which is always a pain because you have to carry around a micro USB cable to charge the case. And if you're an iPhone user, you should always carry around a lightning cable.
The other pro worth mentioning is a little bit obvious but it's the fact that you get extra power. So you can easily make it through a full day of heavy usage and into two days if you moderately use your phone. The iPhone 6s coupled up with the Smart Battery Case is supposed to offer up around 25 hours of talk time, 20 hours of video playing, and 18 hours of web browsing over LTE.
All in all, there's no question this is the ugliest iPhone 6s battery case on the market. Just look at it. Where the design really falls flat with its function. It doesn't charge the iPhone 6s' battery completely. It doesn't feature an on/off switch and the LED indicator is on the inside of the case. It just doesn't do a whole lot compared to other third party cases on the market. For example, if you look at something like the Mophie Juice Pack, you can turn it on/off, you can view how much battery power is left on the back of the case, it can give you 60% more battery power, and it doesn't look like it's smaller than an iPad or a developed carcinoma. And it costs anywhere from $60-$100, depending on the type of Mophie Case you select.
If you like the official “Smart Battery Case” from Apple, great but just keep in mind there are other options out there.