Much of Indonesia sits above 75 percent relative humidity for large parts of the year, at temperatures around 27 to 30 °C. That climate is hard on electronics in quiet ways: corrosion, mould in foam, fogged lenses and tired batteries.
What humidity does
- Corrosion. Damp air, sweat and salt slowly corrode charging contacts and connectors, especially near the coast.
- Condensation. When a cold device meets warm, humid air, water forms on and inside it.
- Mould. Foam face cushions, cases and bags stored damp can grow mould.
- Sticky buttons and fogged lenses are often the first visible signs.
The air-conditioning jump
The most common condensation problem in Indonesian cities is not rain. It is walking out of a cold mall, office or car into a humid street. The phone or headset is cold; the air is warm and wet; water forms on it in seconds.
Keep devices in a bag or pocket for ten minutes after leaving a cold room. Let them warm gradually before you use the camera, charge them or put a headset on.
Target ranges
| Relative humidity | For electronics |
|---|---|
| Below 30% | Uncommon here. Static and brittle plastics. |
| 40–60% | Comfortable for storage and use |
| 60–75% | Acceptable for daily use; watch stored items |
| Above 75% | Store spare devices in a dry box |
Building a simple dry box
- Choose a plastic container with a tight-sealing lid, big enough for the device with space around it.
- Add silica gel packets or a reusable silica canister. Colour-change gel shows when it is saturated.
- Put a small hygrometer inside so you can see the reading.
- Recharge or replace the gel when the reading climbs. Many reusable canisters can be dried following the maker’s instructions.
Do not seal a device that is already wet in a dry box and forget it: dry it in moving air first.
Heat, day to day
Phones protect themselves by slowing down and stopping charging when they get too hot. If you see a temperature warning, move into the shade, stop charging and close heavy apps. On a motorbike, a handlebar mount in full sun can push a phone into thermal shutdown during navigation. A mount with some shade, a lower screen brightness and charging only when needed all help.
Salt air
Coastal homes in Bali, Lombok, Makassar or along the Java coast see faster corrosion on ports, buttons and headphone jacks. Wipe devices with a dry cloth more often, keep chargers off window ledges and store spare devices away from the sea breeze.