Why battery health matters
Battery health is the most direct indicator of whether your phone battery needs replacing. A phone that dies by 2pm, shuts down unexpectedly, or charges painfully slowly is almost always suffering from degraded battery health — not a software problem, not a “phone getting old” inevitability. A battery replacement for most phones costs $30–$80 in Singapore and takes 15–30 minutes. It’s one of the best-value repairs available.
How to check battery health
iPhone
Settings → Battery → Battery Health & Charging. You’ll see a percentage. Apple recommends battery replacement when health drops below 80%. At that point, iOS may also enable Performance Management — a hidden throttle that slows the phone to prevent unexpected shutdowns on a weak battery.
- 100–90%: Good. No action needed.
- 89–80%: Noticeable degradation. Consider replacement if battery life bothers you.
- Below 80%: Apple officially recommends replacement. Performance Management may be active.
- Service warning shown: Replace now — Apple has detected a significant issue.
Samsung & Android
Samsung does not show battery health as a percentage in standard settings. To check accurately:
- Dial *#0228# on Samsung devices — opens a battery diagnostic screen showing current charge and health indicators
- Use a third-party app like AccuBattery — measures your actual charge capacity over several charge cycles and calculates health from that
- Ask a repair shop — we can read battery health directly from diagnostic tools in-store
What “charge cycles” means
A charge cycle is one full 0–100% charge, regardless of how it’s done. Charging from 50% to 100% twice counts as one cycle. iPhone batteries are rated for approximately 500 charge cycles before capacity drops to 80%. In Singapore, where phones are often charged multiple times a day due to heavy use and heat, batteries may degrade faster than in cooler climates.
Singapore heat factor: Heat accelerates battery degradation significantly. Leaving your phone in direct sunlight, using it while charging in a hot room, or heavy gaming generates heat that damages battery chemistry faster than normal use. If you’re in a non-air-conditioned environment frequently, expect faster degradation.
Signs your battery needs replacing — even without checking the percentage
- Phone dies at 15–30% charge — the remaining percentage is inaccurate because the battery can’t hold charge consistently
- Battery percentage jumps — drops suddenly from 40% to 10% without explanation
- Phone shuts down unexpectedly under load — gaming, calls, camera — the battery can’t sustain the current draw
- Very slow charging — the battery’s internal resistance has increased
- Phone feels warm even at idle — degraded battery cells generate more heat during normal use
- Swollen back panel — this is a failing battery expanding from gas buildup. Replace immediately — swollen batteries are a fire risk
🔴 Swollen battery — do not ignore this. If your phone back panel is lifting or the screen is being pushed out from underneath, the battery is swollen with gas. Do not charge it. Do not leave it unattended. Bring it in for replacement immediately — swollen lithium batteries can catch fire.
OEM vs aftermarket battery — what to ask for
At Certified Phone Repair, we use Grade A OEM-equivalent batteries that match the original capacity and chemistry. Cheap aftermarket batteries from unknown sources often have lower actual capacity than stated, degrade faster, and in worst cases can swell sooner than expected. Always ask what brand or grade of battery a shop is installing before agreeing.
Related terms
- Grade A Parts — what OEM-equivalent means for batteries and screens
Walk in to Certified Phone Repair at Westgate or AMK Hub. Battery replacement takes 15–30 minutes, from $30, 60-day warranty.
