I kept my old phone alive by replacing one part; it cost way less than an upgrade

I was starting to think my old phone had reached the point where replacing it made more sense than keeping it around. The battery didn't last nearly as long, and I was charging it more often to get through the day.

The screen was in good condition, performance was satisfactory, and I didn't see any reason to purchase a new device. The only issue was the battery.

This made me consider what would happen if I focused on the battery instead of replacing the entire phone. I started looking into what a replacement would involve, how difficult it would be, and whether it made financial sense.

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Posts 11
By  Jon Gilbert

The battery can make a perfectly good phone feel old

One aging component made me think of an upgrade

A phone doesn't necessarily become outdated when its battery starts wearing out. The processor, cameras, display, and software can still do exactly what I need, but charging the phone more often can make the device feel past its prime.

That's because battery degradation changes how long I can use the phone before I reach for a charger. Lithium-ion batteries lose capacity as they go through charge cycles, and shorter battery life is a normal sign of an aging battery.

This can easily be confused with the phone becoming outdated. When I have to charge it halfway through the day, carry a power bank, or worry about the battery percentage, a phone that otherwise works perfectly starts feeling like it's time for an upgrade.

I checked the battery before blaming the phone

A dying battery isn't the only reason a phone drains quickly

I still use an old OnePlus as my secondary phone, and every time I pick it up, I notice how much shorter the battery life has become.

Before deciding that a phone needs a new battery, I'd check what's using the power. Android's Settings > Battery > Battery usage section shows which apps consume the most battery, although the exact menu varies by manufacturer.

If one app is using an unusually large amount in the background, restricting it or changing its settings may make a noticeable difference without replacing anything.

Monitor battery behavior. A gradual decline in battery life over several years usually signifies normal wear and tear. However, if you notice a sudden change in battery performance, it's worth looking into before concluding the battery has reached the end of its life.

Some newer phones make this easier by showing battery-health information. For example, Google provides a Battery health screen on Pixel devices that estimates remaining capacity compared with the battery's original capacity.

Not every Android phone offers an equivalent feature, so on other devices, battery-usage behavior and manufacturer diagnostics may be more useful.

When a battery replacement can be better than replacing the phone

The repair cost made me rethink upgrading

When the battery is the main thing holding an otherwise good phone back, replacing it can be much cheaper than replacing the entire device.

I checked what a battery replacement would cost for my old phone where I live, and the quote came to around $40. That's a very different proposition from spending several hundred dollars on a new phone because the battery no longer lasts as long.

That doesn't mean a battery replacement is always the right choice. I'd still consider the phone's age, remaining software and security support, overall condition, and whether anything else is starting to fail.

If the phone has a cracked display, poor performance, or is nearing the end of its software-support period, a battery replacement may not make as much sense.

Why replacing the battery isn't as simple as it used to be

The biggest obstacle is getting to the battery

Replacing a phone battery used to be simple: remove the back cover, pull out the battery, and put in the replacement.

Modern phones are a different story. Batteries are often secured with adhesive, while the back panel or display may also be glued down.

Getting to the battery can mean carefully opening the phone, removing adhesive, disconnecting components, and making sure I don't damage anything along the way.

Adhesive is commonly used for durability, water resistance, and to help manufacturers build thinner devices, but it can make repairs considerably more difficult.

There's also a practical reason batteries aren't sitting inside a removable plastic compartment anymore. Modern smartphone batteries are thin and flexible lithium-ion cells that need secure housing inside the phone. Adhesive helps prevent the battery from shifting or being damaged by other components.

That doesn't mean every modern phone is equally difficult to repair. Some manufacturers have started using designs that make battery replacement easier.

iFixit's current repairability database, for example, lists the Fairphone 6 as having an adhesive-free battery replacement that takes only a few minutes, while other phones still use strongly glued batteries.

Taking a phone to a repair shop may not pose a problem. But for anyone who wants to replace a battery at home, the difference is significant.

What used to take a few seconds can now require the right tools, patience, and a willingness to open a device that wasn't designed with repairability in mind.

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By  Jon Gilbert

A new battery can give an old phone a second life

A phone doesn't become obsolete because its battery has lost capacity. That's why I think it's worth considering a battery replacement before automatically shopping for a new phone.

If my phone's display, cameras, performance, storage, and software still meet my needs, a battery replacement could solve my problem without requiring a full upgrade.

However, a new battery alone won't make every old phone worth keeping. Factors like software support, overall condition, performance, and repair cost matter.

But when battery life is the main thing making a phone frustrating to use, replacing that one component can give an otherwise capable device more useful time.