iPhone Battery Swelling: Dangers and What to Do Immediately
Safety Warning
- A swollen battery is a fire and toxic fume hazard — stop using immediately
- Do NOT charge, puncture, or try to remove it yourself
- Place on a non-flammable surface and bring to a professional
What Is Battery Swelling?
Battery swelling occurs when gases build up inside a lithium-ion cell faster than the chemistry can absorb them. The aluminium pouch expands, pushing against the screen and chassis. Common causes: age/cycle degradation, excessive heat, overcharging faults, manufacturing defects, physical damage. See battery chemistry explained for the science.
Warning Signs
- Screen lifting from the frame, especially along the bottom edge
- Case or back glass warping outward
- Phone won't sit flat — rocks on a table
- Touch screen issues near the edges
- Case no longer fits properly
What to Do Immediately
- Stop using and power down
- Do NOT charge it
- Do NOT puncture or squeeze the battery
- Place on a non-flammable surface (ceramic, metal, concrete)
- Keep away from water
- Do NOT put in household rubbish (illegal under UK Waste Batteries Regulations 2009)
- Bring to a professional repair shop for safe removal
Is It Dangerous?
Yes, but manageable with proper handling. The main risk is thermal runaway — temperatures reaching 500°C+, causing fire, toxic hydrogen fluoride fumes, and potential explosion. Risk is triggered by puncture, extreme heat, or continued charging. If you stop using it immediately, the risk is low.
Can It Be Repaired?
No. A swollen battery cannot be deflated or reconditioned. Professional replacement is the only option. Costs vary by model — see our pricing guide.
Prevention
- Replace batteries proactively when health drops below 80%
- Avoid extreme heat and direct sunlight
- Use quality, certified chargers
- Don't store at 100% charge for extended periods
Frequently Asked Questions
Can I still use it if only slightly swollen?
No. Even minor swelling indicates gas buildup. Power down and seek professional help immediately.
Does Apple replace swollen batteries free?
Under warranty or AppleCare+, possibly. Out of warranty, standard rates apply. If Apple no longer services your model, celltech can help.