What Happens to Apple Pencil Pro Battery If Left Unused on iPad

Apple Pencil Pro magnetically snapped to the charging edge of an iPad Pro

If you leave your iPad and Apple Pencil Pro untouched in a drawer for weeks, you might wonder if the stylus battery will drain completely. I’ll show you how the magnetic charging system behaves and how to protect your pencil’s battery life.

1. Understand Magnetic Trickle Charging

When snapped to the side of your iPad, the Apple Pencil Pro continuously receives power from the tablet. As long as your iPad retains battery power, the pencil stays at 100%.

iPad screen displaying the Batteries widget showing Apple Pencil at 100 percent
Check Apple Pencil Battery Percentage Widget.

2. Watch for iPad Battery Depletion

If your iPad drains down to 0% and shuts off, the pencil stops receiving current. The stylus will slowly self-discharge over 2 to 3 weeks.

Holding the Apple Pencil Pro off the iPad to demonstrate standby battery drain
Remove Pencil to Test Self Discharge.

3. Prevent Deep Lithium Cell Discharge

Never leave your Apple Pencil Pro disconnected in a desk drawer for months at 0% charge. A completely flat lithium battery can enter sleep mode and refuse to charge again.

Snapping the pencil back onto the magnetic strip to show the instant charging animation
Reattach Pencil to Trigger Charging Bubble.

4. Snap It In to Revive Standby Power

Snap the pencil back onto the magnetic strip and plug your iPad into its wall charger. A green battery pop-up on the screen confirms charging is restored.

Demonstrating squeeze sensor responsiveness and Find My tracking features
Test Squeeze Gesture and Haptic Feedback.

Helpful Tips

If your pencil does not register after long storage, leave it attached to a charging iPad for at least 30 minutes to revive the low-voltage cell. Read more tablet maintenance advice in our Apple iPad category or browse Apple & iOS.


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