What to Do With a Swollen Power Bank: Emergency Steps and Safe Disposal

If your power bank suddenly looks thicker than usual — the casing bulging, the seams splitting, the body no longer sitting flat on a table — that's a swollen power bank. Here's the honest truth, based on safety guidance from Samsung, CNN, and battery experts: a swollen power bank cannot be fixed. The correct response is to stop using it and dispose of it safely.

Why does it swell?

Most power banks use lithium-ion or lithium-polymer cells. When a cell ages, overheats, gets overcharged, suffers physical damage, or was built with cheap cells lacking proper protection circuits, the electrolyte inside breaks down (electrolyte decomposition) and releases gas. That gas gets trapped inside the sealed cell, pressure builds, and the pack expands. Heat is the biggest accelerator — a power bank left in a hot car or charged overnight for years is a classic candidate.

Emergency steps (do these now)

1. Stop using and stop charging it. Charging generates more heat and gas — the exact opposite of what you need. Unplug everything.
2. Don't press, puncture, or try to "deflate" it. Pressing can tear the layers inside the cell and cause an internal short. Puncturing is far worse: lithium electrolyte is flammable.
3. Move it to a fire-safe surface. A ceramic tile floor, a baking tray, or a ceramic plate — somewhere away from fabric, wood, and paper. Keep kids and pets away.
4. Don't wrap it tightly or tape its vents shut. The gas needs somewhere to go; sealing it raises internal pressure.
5. Watch for escalation signs. If it feels hot, hisses, smokes, or smells strongly of chemicals, take it outside immediately and call local emergency services. Don't use water.

One thing people forget: never fly with a swollen power bank. Aviation rules treat power banks as spare lithium batteries (cabin only), and damaged or swollen units are banned from flights entirely.

The freezer myth

You've probably seen the advice to put a swollen battery in the freezer to "shrink" it. It's a myth. Samsung explicitly advises against putting electronic devices or their components in a fridge or freezer. Cold doesn't remove the trapped gas, so the swelling won't deflate — and once the battery warms back up, the pressure is right back. As CNN reported, the only real fix for a swollen battery is replacing it. Swelling can be prevented, not cured.

How to dispose of it safely

1. Drain it fully — use it until dead or leave it until it dies on its own. A charged pack can short during transport.
2. Tape the terminals — cover all USB ports and exposed metal with electrical tape to prevent accidental short circuits.
3. Bag it in non-conductive packaging and label it as a swollen lithium battery so handlers know to use special procedures.
4. Take it to an e-waste collection point — never household trash, never burn it, never toss it in a river. In Indonesia, used batteries are classified as B3 hazardous waste; check your local environmental agency (Dinas Lingkungan Hidup) or e-waste drop boxes in major cities.
5. Transport carefully — don't stack heavy items on it or let it get crushed.

Preventing it next time

When you replace it, prioritize listed safety protections — overcharge, short-circuit, over-current, and temperature protection — over the biggest mAh number. Buy from official channels with a real warranty; no-name packs without protection circuits are the most common swelling cases. And build better habits: unplug when full, keep it out of heat, and use quality cables and chargers.

I wrote a longer Indonesian version of this safety guide with the full step-by-step and prevention tips here: https://www.miftahulrizki.eu.org/2026/10/cara-mengatasi-powerbank-kembung.html. Stay safe out there.