iPhone Battery Sharing Works Through Wireless Power Transfer

Battery sharing on iPhone uses a feature called wireless power transfer that lets one iPhone charge another iPhone wirelessly, without any cable between them. You place the two phones back-to-back, and the phone with more battery sends power to the other. This feature is built into iPhone 14, iPhone 15, and iPhone 16 models — older iPhones cannot use it.

The phones must be touching or very close together for the transfer to work. The process is slower than charging from a wall outlet or cable, but it works in situations where you have no charger available and another iPhone nearby with enough battery to share.

Key Takeaways

  • Battery sharing only works on iPhone 14, iPhone 15, and iPhone 16 models; both phones must support the feature for it to work.
  • You need at least 20 percent battery on the sending phone to start sharing, and it will stop automatically if that phone drops below 20 percent.
  • The two phones must be placed back-to-back and held still or positioned in a stand for the transfer to continue.
  • Battery sharing transfers power much slower than a wall charger, so expect to add only 10 to 15 percent to the receiving phone in 30 minutes.
  • Remove any thick phone cases or metal objects between the phones, as these block the wireless signal needed for power transfer.

How to Turn On Battery Sharing Between Two iPhones

Open the Control Center on the phone that has the battery you want to share. On iPhone 14 and later, swipe down from the top-right corner of the screen. Look for the Battery icon in the Control Center — it shows your current battery percentage.

Press and hold the Battery icon. A menu will appear with options including "Low Power Mode" and "Wireless Power Sharing." Tap "Wireless Power Sharing" to turn it on. The phone will show a message saying it is ready to share battery.

Take the phone that needs charging and place it back-to-back against the phone that is sharing battery. The phones should be touching or within a quarter-inch of each other. You will see a charging animation on the receiving phone's lock screen showing that power transfer has started.

Requirements and Limits for Battery Sharing

Both phones must be iPhone 14 or newer for wireless power sharing to work. If one phone is an iPhone 13 or older, the feature will not appear in the Control Center, and you cannot use battery sharing with that device.

The phone sending battery must have at least 20 percent charge remaining. If the sending phone's battery drops to 20 percent or below during the transfer, the feature will stop automatically to protect that phone's battery health. You cannot override this limit.

The receiving phone cannot be in Low Power Mode for battery sharing to work. If Low Power Mode is on, turn it off first by going to Settings > Battery, then try the transfer again. Some users find this counterintuitive — you would think Low Power Mode would help, but Apple designed it to prevent power transfer when the phone is already trying to conserve energy.

Positioning and Environmental Factors That Affect Transfer Speed

Remove any thick phone cases before attempting battery sharing. Silicone cases, leather cases, and especially metal cases or metal phone rings will block the wireless signal. If you have a case on, take it off, position the phones, and then you can put the case back on after the transfer is complete.

Keep the phones still and in contact with each other. If you are holding them, make sure the back surfaces are pressed together. If you want to charge while doing other things, place both phones in a stand or prop them against each other on a flat surface. Movement or separation will interrupt the transfer.

Battery sharing works slower in cold temperatures. If your phone is cold, let it warm up to room temperature first — the transfer will resume at normal speed once the phone is warm enough. Avoid direct sunlight while sharing battery, as this can cause the phones to overheat and pause the transfer.

How Long Battery Sharing Takes and What to Expect

Wireless power transfer is much slower than charging from a wall outlet or a cable. In 30 minutes of continuous transfer, you can expect to add roughly 10 to 15 percent battery to the receiving phone. This varies depending on the models involved and environmental conditions.

The transfer speed also depends on how much battery the sending phone has. If the sending phone has 50 percent battery, it will transfer power faster than if it has exactly 20 percent. The closer the sending phone gets to 20 percent, the slower the transfer becomes.

You will see the battery percentage on the receiving phone increase in real time. The lock screen will show a charging animation with a small battery icon. If the animation stops or the percentage stops increasing, check that the phones are still touching and that neither has moved.

Troubleshooting When Battery Sharing Does Not Work

If the Wireless Power Sharing option does not appear in your Control Center, confirm that both phones are iPhone 14 or newer. This feature is not available on iPhone 13 or earlier models, and there is no way to add it to older phones.

If the option appears but the transfer will not start, check that the sending phone has at least 20 percent battery. Even if the percentage shows 20 percent exactly, some users report that the transfer works better if the battery is at 21 percent or higher. Wait a few seconds after turning on Wireless Power Sharing before placing the phones together.

If the transfer starts but stops after a few seconds, the phones may have separated slightly. Press them back together firmly and hold them still. If you are using a stand, adjust the angle so the backs are flush against each other. Also check that neither phone is in Low Power Mode — if the receiving phone turned Low Power Mode on automatically, turn it off manually.

If the phones are warm to the touch, the transfer may pause to prevent overheating. Move both phones away from direct sunlight and let them cool for a few minutes. The transfer will resume once the temperature drops.

Alternatives When Battery Sharing Is Not an Option

If you have an older iPhone that does not support wireless power sharing, a portable battery pack is the most practical alternative. These are small external batteries that charge through USB-C or Lightning and can charge any iPhone model. They are inexpensive and work much faster than wireless power transfer.

If you have access to a wall outlet, a USB-C to Lightning cable and a power adapter will charge your phone in 30 to 45 minutes — significantly faster than battery sharing. Many public spaces like coffee shops, airports, and libraries have outlets available.

Some newer iPhones also support MagSafe charging, which uses a magnetic wireless charger. This is faster than battery sharing and does not require another iPhone, though you do need a MagSafe charger and a power source.

Frequently Asked Questions

Can I use battery sharing if my phone is in airplane mode?

Yes, airplane mode does not affect wireless power sharing. The feature uses a different wireless technology than cellular or Wi-Fi, so airplane mode will not stop the transfer. You can leave airplane mode on and battery sharing will still work.

Does battery sharing damage the battery health of either phone?

Wireless power sharing is designed to be safe for both phones' batteries. Apple built in protections that stop the transfer if either phone gets too warm or if the sending phone drops to 20 percent. Occasional battery sharing will not noticeably affect long-term battery health.

Can I use battery sharing with an iPhone and an Apple Watch?

No, battery sharing only works between two iPhones. Apple Watch, AirPods, and other Apple devices cannot receive power through this feature. You would need a dedicated charger for those devices.

What happens if I move the phones apart during a transfer?

The transfer will stop when ready if the phones separate. You can start again by placing them back together and waiting a few seconds for the charging animation to reappear. There is no penalty for interrupting the transfer — you straightforward pick up where you left off.

Is battery sharing faster if both phones are the same model?

Transfer speed is similar regardless of whether the phones are the same model, as long as both are iPhone 14 or newer. The main factors affecting speed are the battery percentage of the sending phone, temperature, and how firmly the phones are pressed together.