“Yesterday still okay.” Today the battery looks different.

Different already? Stop first

Wah lau, yesterday’s ride cannot clear today’s pack. A battery can work on one trip and look different on the next. That change is the point where testing stops—not the start of a home investigation.

Swelling, leaking, unusual heat, strange smell, hissing, cracking or visible damage means stop using it and stop charging it. Don’t deliberately touch or sniff it to check. The rider does not need to identify the exact fault before taking the warning seriously.

The featured pack carries several kinds of damage at once, but the photograph still does not tell us the full sequence that produced them. It shows why a visible change matters. It does not give permission to diagnose the pack from one angle or declare another pack fine because it looks less dramatic.

Water, cracks, swelling: don't test it

Water exposure has its own version of “yesterday still okay”: the outside dries, the casing looks normal again, and somebody proposes one quick charge. The rule does not change. Treat it as possible damage: stop using and charging it, and have it checked. Drying the outside doesn’t show what happened inside.

Aiyo bro, screwdriver emoji is not a certificate. Don’t press, open or poke a suspect pack. Don’t touch or sniff it to check. Opening it still leaves the rider without a proper diagnosis.

Photos are useful when they record what changed: the gap, lifted wrap, stain, connector area or damaged case. Their limit matters just as much. A photograph can document a clue and help the maker decide what information is needed next; it cannot clear the pack for use.

What now

Keep the message simple when contacting the maker or authorised service provider: say what changed and send photographs from outside the pack. Do not turn the call for help into a transport plan before asking what to do.