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One bud will not charge in the case. A five-minute cross-test tells you whether to replace the earbud or the charging case — before you spend anything.
Before you start
1Charge the case fully first
A case running low often powers only the pocket it can. Put the case on charge for a full hour with both buds out of it, then try again. This alone resolves a surprising share of "one side is dead" reports, and it costs nothing.
2Look at the contacts under a torch
Two small gold pads on the bud, two sprung pins in the pocket. You are looking for grey film, green tint, earwax, or a pin that sits lower than its neighbour. A collapsed pin is the single most common hardware cause and it is visible once you know to look.
3Clean both sets of contacts
Damp — not wet — cotton swab with isopropyl alcohol. Wipe the pads on the bud, then the pins in the pocket. Dry-pick lint out of the pocket with a toothpick. Give it two minutes to dry, then seat the bud and watch for the charging LED.
4Run the cross-test — this is the step that decides
Take the bud that DOES charge and put it in the pocket of the bud that does not. Wait a minute. If the known-good bud charges in that pocket, the pocket and the case are fine and the fault is in the other earbud. If the known-good bud also refuses to charge there, the case pocket is dead and the earbud may be perfectly healthy. This one swap is the difference between buying the right part and guessing.
5Confirm before you buy
Repeat the cross-test once more after a full case charge. Two consistent results in the same direction is enough. If the results contradict each other, the contacts are still dirty — clean again rather than ordering.
Get the parts for this repair
The cross-test says the bud is dead. Can I just replace that one bud?
Yes, that is exactly what a single replacement bud is for. You buy the same side and model, reset both buds together, and carry on using the case and the surviving bud you already own.
The cross-test says the case pocket is dead. Do I need new buds too?
No. If both buds charge fine in the working pocket, both buds are healthy and only the case needs replacing. On almost every budget TWS the case battery is glued in and not separately serviceable, so the case is the unit you replace.
Can I replace just the battery inside the earbud?
Not practically. The cell inside a bud is a sealed pouch of roughly 30-60 mAh behind a glued shell, and reaching it means destructive disassembly plus micro-soldering. There is no consumer-serviceable battery in a TWS earbud, which is why replacing the whole bud is the normal fix.
It charges sometimes and not others. What does that mean?
Intermittent charging is almost always contacts rather than a dead cell. Clean both sides again, check that the bud seats fully with a small magnetic click, and look for a pocket pin that does not spring back when pressed.
Stuck mid-repair? Email support@sparexo.com with your order number — we help with every part we sell.