Know which batteries are about to die — before they do.
Volt tracks every battery-powered device in your house: remotes, smoke detectors, keyboards, toys. Log when you last swapped batteries, and Volt tells you what's running low.
Free for up to 3 devices. Volt Pro unlocks unlimited devices, spare-battery inventory, and low-battery alerts — one-time purchase, $2.99.
One list, every battery in the house.
Charge-level estimate
Tell Volt how long a set of batteries usually lasts in a device, and it estimates the charge level from the day you last replaced them.
Spare inventory
Track how many spare AA, AAA, C, D, 9V, and coin batteries you have on hand, and tap to use one straight from the list.
Low-battery alerts
Pro can nudge you before a device actually dies, so the smoke detector doesn't start chirping at 2am.
Set it up once, glance at it forever.
Add your devices
Remote, detector, keyboard — whatever runs on batteries. Pick the battery size and how long you expect a set to last.
Replace and log
Swap the batteries, tap "Replaced," and Volt resets the charge estimate for that device.
Check before it's too late
Open Volt any time to see which devices are running low, sorted so the most urgent ones are on top.
Volt Pro
Unlimited devices, spare-battery inventory across all sizes, and low-battery alerts. A single $2.99 purchase, unlocked forever.
Get Volt