What you need

Almost every rechargeable disposable today uses a USB-C port. You only need the cable — not a fast-charging wall brick. The safest power source is a standard 5V USB port: a laptop, a power bank, or a low-output phone charger.

• Use a USB-C cable (most phone cables work).
• Plug into a low-power USB port, not a high-wattage fast charger.
• Charge on a hard, non-flammable surface.

Step by step

Charging takes just a few minutes for most devices:

• 1. Plug the USB-C cable into the device and a 5V USB port.
• 2. Watch the indicator light — it usually turns on (often red or pulsing) while charging.
• 3. When the light turns green or switches off, the battery is full.
• 4. Unplug it. Most top-ups take 10–30 minutes; a full charge is rarely more than an hour.

Battery safety dos and don’ts

• Do charge where you can see it and unplug when full.
• Do let a hot device cool before charging.
• Don’t charge overnight or leave it unattended for hours.
• Don’t use a damaged cable or a device that is swollen, cracked or leaking.
• Don’t expose it to direct heat, water or a hot car.

Frequently asked questions