Never let 0% surprise you.
Redesigning a battery utility into a complete app that rings at the level and length you choose.
A battery guardian that speaks up before it is too late.
Low Battery Alarm lets people set custom alerts for any battery percentage, with an audible alarm of a chosen length. The product design team took it from a single utility screen to an account-based app: onboarding, authentication, alarm setup, payment and feedback.
Built-in warnings are fixed, silent and easy to miss.
Fixed thresholds
System alerts fire at preset levels. Heavy users need warnings earlier, light users later.
Easy to miss
A banner or a single beep goes unnoticed in a bag, in a meeting or during a call.
No control
People cannot choose how long an alert lasts or keep several alerts for different situations.
What shaped the design.
Percentage matters most
A single slider for the trigger level is the primary action and sits at the top of the setup card.
Duration needs a familiar control
A minute and second wheel picker feels like the native timer, so no learning is needed.
Alarms are a list, not a setting
Users keep several alarms and switch them on and off, so each gets its own toggle row.
Charging state builds trust
Showing level and charging status together confirms the app reads the real battery.
Install to first alarm in five steps.
Green on black. Status at a glance.
Splash
A glowing battery icon and one clear call to action set the tone.
Login
Pill inputs, password reveal and Google, Facebook and Apple sign-in.
Verify email
Four large digit boxes with a resend link keep the step quick.
Home
Battery level, charging state, slider, wheel picker and an alarm list with toggles.
Payment method
E-wallets and cards are grouped. The selected option is outlined in green.
Feedback
Three fields and a single Send action.
A small kit with one loud color.
What the project taught us.
One accent color does the work
Green means safe and charging, red means low. Limiting the palette made status readable instantly.
Reuse native patterns
The wheel picker removed the need for instructions and cut setup errors in testing.
Test copy early
Small label fixes, such as the spelling in the percentage prompt, are worth catching before handoff.
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