Apps I Created An App That Graphs Battery Levels & Makes Smart Predictions! Perfect For All Of Us Who Care About Battery Life :)

[j_blrd]

Like many of you, I am always trying to extend my watch’s battery life and was frustrated that a battery graph wasn’t included in watchOS. The app ended up growing into much more than just a battery grapher however.

Battery Grapher graphs your Apple Watch's historical battery levels and learns your habits to intelligently predict what your future battery levels will be. Future battery level predictions get better the longer you use the app!

Developed specifically with energy consumption in mind, Battery Grapher has almost no impact on battery life. The app runs a background task only once an hour, and doesn't require an iPhone or internet connection, which keeps battery consumption extremely low

Battery Grapher costs $1.99, and has no in app purchases or ads. Just putting an app on the App Store costs $99/year, so I hope you can understand the small cost. Also, it will allow me to continue adding new features to the app

https://apps.apple.com/us/app/battery-grapher-for-watch/id1498632956?ls=1

I so far I am planning to add:

• Real time battery graph for large complications
• Stats page with more detailed battery info (%/hr, time since last charge, etc.)
• Feel free to comment any other features you want to see on the app!

I live in Hong Kong and schools are closed for the next 4+ weeks because of the corona virus, so I will have plenty of time to add new features!

- Joshua Bird

Edit: Added complication image!

 

[MacGarage]

My first impression is that this is a very nice app and I like the complications (infographic corner one is great!).

You should add some images of the complications as it may be helpful for those interested in replacing the battery complication.

 

[sjinsjca]

This is great! Thanks, I'm having fun with this.

 

[Panther61]

Looks great Joshua will give it a try and download tonight! I will be sure to leave a review on the app. store so you can continue your work!

 

[joedan76]

Thanks very much, such a useful app and worth the money.

You have kept it neat and tidy really just feels like it's part of watchOS.

 

[j_blrd]

Thanks for the kind words everyone! I added an image of what the complications look like.

Feel free to tell me anything you want to see in the next update!

 

[zanswer]

Hey j_bird,

I have a couple of questions for you. I’ve already get your app, cool idea, but I didn’t get, is iPhone app right now is only needed to install watch app or it can do something else? Is iPhone app needed to get updates of watch app in feature or it can update itself without iPhone app?

 

[j_blrd]

The iPhone app currently doesnt have much on it, but in future updates I plan to add more to the iPhone app (things like changing settings and looking at the battery graph).

 

[Apple_Robert]

Purchased the app just now. Very nice Joshua. I like the 2 notification options. To make me smile even more, I would like to see a third notification option that would remind you to charge the watch at a certain time each day.

 

[tbeaumont]

Would be good to know the number of battery cycles and the date the battery was made like CoconutBattery.

 

[Itinj24]

Just installed. I’ll be playing around with it later when I have some time.

 

[sjinsjca]

Quick question: what is the impact of this app (when installed in the Dock as instructed) on battery life?

The developer has answered in the first post and with more detail in post 18.

 

[Apple_Robert]

Quick question: what is the impact of this app (when installed in the Dock as instructed) on battery life?

For what it’s worth, I have had it on my Infograph face since 7am est today, and haven’t experienced any battery drain from it.

 

[Itinj24]

App looks good so far after playing for a few minutes.
Quick question... in the watch app, under complication, it says “Gauge Max Hours” and lets you select a number from 6-48 going by 3’s. What’s that for? I’m using the large dead center complication on the Infograph Modular face. Sorry if it’s obvious but I only slept three hours last night and I’m having a hard time concentrating lol.

 

[j_blrd]

The "gauge max hours" changes the max hour on the gauge. There are only gauges for the complications on the infograph face.
For example, if you have 6h of predicted battery left, if you set the gauge max hours to 12, the gauge will be half full, and if you set it to 24, it will be a quarter full. Hope that makes sense!

 

[Itinj24]

The "gauge max hours" changes the max hour on the gauge. There are only gauges for the complications on the infograph face.
For example, if you have 6h of predicted battery left, if you set the gauge max hours to 12, the gauge will be half full, and if you set it to 24, it will be a quarter full. Hope that makes sense!

Yes it does. Thank you.

 

[Itinj24]

After using for the better part of the day, I must say, outstanding app! Great job, dev!

 

[j_blrd]

Quick question: what is the impact of this app (when installed in the Dock as instructed) on battery life?

In my testing, it was <1% per day. The background task only runs once an hour. The background task takes about 0.09 seconds to run, so its energy impact is almost negligible.

 

[KarimLeVallois]

I've just purchased as I think this is great and want to support good Apple Watch developers.

 

[eclipse01]

Does this app show you the apps that are effecting battery life the most? (similar to the iphone app)

 

[huff825]

Just bought it. I’ll let you know what I think. Looks really useful.

 

[xraydoc]

Purchased. Looks very interesting. I’ll post some feedback in a few days.

 

[BigMcGuire]

Purchased. Saw you on Reddit (I believe?) before you posted here. Was wondering if it would ever make it here. Always wanted an app like this for my watch! Thanks!

 

[sjinsjca]

Those who might have the misimpression that this app is just a toy with no real utility might want to check out a post where I use it to evaluate the battery-life cost of transferring hundreds of megabytes to the Watch. (Spoiler: little or no impact at all, to my surprise.)

Really, the Battery Grapher app is very useful indeed!

 

[xraydoc]

Those who might have the misimpression that this app is just a toy with no real utility might want to check out a post where I use it to evaluate the battery-life cost of transferring hundreds of megabytes to the Watch. (Spoiler: little or no impact at all, to my surprise.)

Really, the Battery Grapher app is very useful indeed!

I’m looking forward to notifications of battery life — like being notified at about 30% left and 20% left. Gives me the opportunity to switch to cinema mode to save on some battery should I decide I need it.