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One side running out first is not a defect. It is how TWS earbuds are built — and it is the reason a single replacement makes more sense than a new pair.
Before you start
1One bud does more work than the other
On most true-wireless earbuds, one bud is the primary. It holds the Bluetooth link to your phone and relays audio to the second bud. The secondary mostly listens. The primary therefore keeps its radio busy far more of the time and drains measurably faster on every single charge.
2That difference compounds over years
A lithium cell ages by charge cycles. The primary bud is emptied and refilled more often, so it accumulates cycles faster and reaches the end of its usable capacity sooner. After two to three years, the gap that used to be ten minutes becomes an hour.
3Heat makes it worse, and India is hot
High ambient temperature accelerates lithium ageing. A case left in a car, a bag on a scooter, or a windowsill through an Indian summer will shorten both cells, and the harder-worked one first.
4What this means when you buy
Because the wear is asymmetric, the usual failure is one worn bud beside one healthy bud and a perfectly good case. Replacing the worn side restores the set at a fraction of the cost of a new pair, and the healthy bud carries on.
Get the parts for this repair
Is the faster-draining bud faulty?
Not in the warranty sense. Asymmetric drain is normal behaviour for a relay-architecture TWS set, not a manufacturing defect, which is why brands rarely accept it as a claim.
Can I swap which bud is the primary?
Some models alternate the role automatically and some fix it in firmware. There is no reliable user setting for it on budget earbuds, so it is not something you can manage.
Can I just replace the battery in the worn bud?
No. The cell is a sealed pouch behind a glued shell, and reaching it needs destructive disassembly plus micro-soldering onto a very small cell. Replacing the bud is the only practical route.
Both my buds now die quickly. Should I buy two singles?
Usually not. If both sides are worn, two single replacements plus an ageing case often costs more than a new pair, and you would still be on the old case. Buy singles when one side is clearly worse than the other; buy a new set when both are gone.
Stuck mid-repair? Email support@sparexo.com with your order number — we help with every part we sell.