Wesley's Tool-Box

With some of the smart watches or bands lasting a few days to a week, Apple Watch's claim of an 18-hour use for a typical day in case of the 38mm version was viewed as being too short and even the worries about the device not lasting a full day came about. Apple did claim that the 42mm version had a larger battery and would last somewhat longer. With all these in mind, I decided to log the daily battery status of my 42mm Apple Watch Sport for the past three weeks.

So how was it? First of all, Apple Watch doesn't say anything outright about its battery status unless it drops to 10%, at which it displays the warning you see above. (You could check the exact amount of battery left from one of the Glances whenever you want, by the way.) Personally, it was rare for me to even encounter this message at the end of a normal day, as you'll see later. So that alone tells you that the device is good enough for a full-day use. If you do get to see the warning, you could choose to enter the Power Reserve mode or ignore.

Power Reserve mode shuts down every function except the the time-telling ability like you see above so that it'll function as a watch as long as possible. When the battery does go near 0% (I think it happened around 2% remaining), it'll automatically enter this mode anyway. It's a last ditch effort to maintain its identity until you're able to charge it back to its normal life, so it'll be good if it could be avoided as much as possible.


This graph shows the result of the three-week use, which included all sorts of different usage patterns. Some involved heavy testing; some days I was traveling overseas; and some days I wasn't doing much but mostly sit around the office. All these were boiled down to these coloured bars - green bar represents the actual use time for the day, and the violet bar is the estimated time left until the battery runs out based on the remaining battery percentage noted on the far right.

On average, I got 22 hours and 12 minutes of use per day, with 6 hours and 17 minutes of use left, or about 22%. At no time did the combined time dip below 18 hours. These all clearly indicate that the 42mm version can last one full day of use. And if you forgot to recharge before going into sleep, you still have a good chance that it'll at least last the morning until you can get a two-hour charging session then.

What's also clear is that it will not realistically last full two days unless you use it really sparingly, so you need to get used to a daily recharging routine. Personally, I try to recharge about two hours before bedtime and get into sleep with a fully charged watch. I'm fine with this, but for those wanting to minimize the gap as much as possible, it might be disappointing.

As a smart device that's nearly always on your body, it has the potential to extend or replace existing things better than a smartphone, lessening the need to pull out or find the bulkier device to do the same thing. As I've moved to a fairly large smartphone - iPhone 6 Plus - this is something to look forward to.

One of those things I thought up was the flurry of membership cards that once occupied the wallet. Most of them now sit in a barcode form inside my iPhone, making the wallet considerably thinner. But now those could be moved to the Apple Watch, and I could just pull up my wrist to accrue reward points instead of reaching for my phone.

Because the Passbook app only sent QR codes to the watch, I looked around the Apple Watch App Store and found a couple of apps that can put the card number and the barcode on both types of devices. Eventually, I settled with Stocard, as you can see above. The cards stored on the iPhone app are automatically sync'ed to the Apple Watch app, enabling you to display the wanted barcode from either of the devices. Or, at least that was the idea.


As I loaded up the card data, I noticed that the barcodes were fairly small. It was only about 20.5mm (0.81") wide on my 42mm Apple Watch, which is even smaller than the UPC barcodes found on a product. I wondered if this would be scanned at all.

As a field test, I tried out on two of the biggest hypermarket franchises in Korea: Lotte Mart and Emart. To my surprise, the barcode readers at the stores were able to pick up the numbers without a problem as long as the reader was held close to the watch. The high-density 326ppi display may have helped this.

It's not all completely convenient at this point, though. Because the Apple Watch app has to rely on the iPhone to provide the data due to current SDK limitations, loading speed is slow with my 24-card collection. I have to load the app and make sure the barcode is up before going to the cashier. Hopefully, this will be resolved with the SDK updates later this year.

I had a Wii game console for about six years, and I used to use Wii Fit a lot to stay in shape. Then I bought the Wii Fit Plus upgrade a few months ago. One of the exercises I could do on it was indoor running - I could have the controller in my pocket and run in one spot, and it would record the distance and calories burned.

Since Apple Watch's default Workout app also had an indoor running mode, I thought it would be a great idea to get both technologies to record a run and see the differences. Also, I was severely lacking in the yellow exercise ring's progress that day, so I needed the run anyway. I set both to a 30-minute session and started out simultaneously.


A short while later, I discovered that the distance measurement was getting significantly different. By the time Apple Watch recorded 1km around 7-minute mark, Wii Fit Plus was already at about 1.7km. Working out the math, this came to about 14.5km/h, which seemed too fast for me.

One of the key selling points of the Apple Watch is that it acts as a fitness tracker. Indeed, it knows how much you moved around, what your heart rate is throughout the day, and how many active calories were consumed as a result. These data are all collected on the Health app on the paired iPhone.

While the watch is supposed to automatically check your heart rate every ten minutes, you can manually check using the heart rate "Glance" that you pull up from the main watch screen. This manual checking, which generates about four to five data points while the screen is active, is also logged.

I should note that the Apple Watch OS 1.0.1 update seems to have messed up the automatic checking a bit. Sometimes the measurements for a certain period are not sent and lost; at times the watch simply forgets to take measurements for several tens of minutes at a time. The worst case I've seen was having about 4 hours' worth of log missing, although this is rare and usually it's 1 to 2 hours at most. The problem isn't unique to me and it seems that Apple knows of the problem, so I hope it's fixed in the next update.


Apple Watch's way of tracking, notifying, and displaying fitness data is through three rings - Move (red), Exercise (yellow), and Stand (blue). You set your daily goals for each of the rings and the progress is shown by how much complete the rings are. It's simple yet clear.

By default, the watch tells you how you're doing every four hours, or when one of the goals are met. As for the Stand, it'll tell you to get up and walk around for about a minute at the 50th minute of the hour if it sees that you didn't move much at all for the hour. If you decide to closely follow the Apple Watch's motivation and suggestions, getting the ring filled up is relatively easy and probably makes you a bit healthier, too. I'm personally getting to move around and exercise more as a result.