iPhone batteries wear down chemically over time — Apple itself rates most iPhone batteries for around 500 full charge cycles before capacity noticeably drops, which for a daily-use phone is roughly a year and a half to two years of typical charging habits. Once that happens, iOS quietly starts throttling performance to protect the aging cell from unexpected shutdowns, which is why an old phone can suddenly feel slow even though nothing else has changed.
At MobileSurgeon we fit genuine-capacity replacement batteries, check your Battery Health percentage before and after the swap, and make sure Peak Performance Capability is restored so your iPhone runs at full speed again — not just holds a charge a little longer.
Battery replacement is also one of the most cost-effective repairs available for an iPhone — for most people it's far cheaper than upgrading to a new device, and it directly resolves the two most common complaints people have about an older iPhone: short battery life and sluggish performance.
Battery replacement cost varies by iPhone model, mainly due to battery capacity and how the phone is assembled internally — some models require more disassembly than others to reach the battery safely. Message us your model on WhatsApp for an exact, same-day quote. If your battery is visibly swollen, tell us immediately — that needs prompt, careful handling rather than routine scheduling.
Go to Settings → Battery → Battery Health & Charging. If Maximum Capacity is below roughly 80%, or you see a Peak Performance Capability notice, a replacement will usually make a noticeable difference.
In most cases, yes — iOS deliberately reduces performance on a degraded battery to prevent shutdowns. Once a healthy battery is fitted, that throttling is lifted and normal performance returns.
Most battery replacements are completed same-day, typically within an hour, subject to model and part availability.
A swollen lithium-ion battery should be treated seriously — stop using the phone, don't puncture or bend it, and bring it in as soon as possible. We handle swollen batteries with proper care and safe disposal.
No — battery replacement doesn't touch your storage or software, only the physical battery component. We still recommend having a recent backup as routine good practice for any repair.
If the rest of your phone is working well, a battery replacement is almost always the more economical choice — it directly fixes the two things that make an older iPhone feel outdated, at a fraction of the cost of a new device.