Quick answer: Replace your phone battery when it barely lasts half a day, the phone shuts off while still showing charge, it heats while idle, or the back or screen is lifting from swelling. A swollen battery needs immediate attention. Junaid Telecom & Repairing Lab in Chiniot can advise on WhatsApp 0345 7599995.
Is my battery really worn out, or is it just an app?
Batteries wear out through use. Every time you charge and discharge, a little capacity is lost permanently. After hundreds of full cycles, the battery simply cannot hold as much, so the phone needs charging more often. Heat speeds this up, which matters in Punjab summers.
But worn-out battery symptoms can also be mistaken for software drain. If you haven’t yet, read our guide on fast battery drain and rule out apps, signal and brightness first.
The decision table
| What you notice | What it likely means | What to do |
|---|---|---|
| Phone lasts less than half a day on the same use as before | Capacity is much lower | Plan a replacement |
| Phone dies suddenly at 20 to 40 percent | Battery can no longer supply peak current | Replace soon |
| Percentage jumps (60 to 35 in a minute) | Battery or its reading is unreliable | Replace and recalibrate |
| Phone slows down or restarts under load | Weak battery causing power dips | Check battery first |
| Phone is hot when idle or while charging lightly | Internal fault or damaged cell | Get it checked now |
| Back cover lifts, screen separates, phone rocks on a table | Swollen battery | Stop charging, see below |
| Phone is old but battery lasts a full day | Still healthy | Leave it alone |
What about the “battery health” percentage?
Some phones, including iPhones, show a battery health or maximum capacity percentage. A common rule of thumb is that a battery below roughly 80 percent of its original capacity is worn and worth replacing, especially if you feel the effects in daily use. Many Android phones hide this number or show a different measure, so use your day-to-day experience as the guide.
A battery at 85 percent that gets you through the day does not need replacing. A battery showing 90 percent that shuts down at 30 percent might.
What if the battery is swollen?
A swollen battery is a safety issue. Signs include a back cover that bulges or no longer closes flush, a display lifting at the edges, or a phone that rocks on a flat surface.
- Stop charging and switch off the phone.
- Do not press, bend or puncture it.
- Keep it away from heat and flammable items.
- Get it replaced by a technician as soon as possible.
Details are in our dedicated swollen-battery safety guide.
Is a battery replacement worth it for an old phone?
Often yes, if the rest of the phone works. Compare it honestly:
- Replace the battery if the screen, storage and performance are still fine for you. It’s usually the cheapest way to extend a phone’s life.
- Think twice if the phone is also slow, out of updates, has a damaged display and a faulty charging port, because several repairs add up.
Ask for rates on WhatsApp; they differ per model and change.
How do I choose a good replacement battery?
- Match the exact model. Do not accept “it’s the same size” without checking.
- Be wary of labels claiming huge capacity at a low price. Such claims are usually unverified.
- Ask where the battery comes from and what the warranty on the repair is. Warranty terms are decided by the shop and brand, so ask for them in writing on WhatsApp rather than assuming.
- Make sure the technician checks the charging port too. A bad port can make a new battery look bad.
Can I replace it myself?
Some phones have easy-access batteries, but most modern phones use strong adhesive, and prying a lithium battery can puncture it. Heat guns also push a battery toward failure. If you are not trained, take the phone to a technician. After replacement, charge normally; no special “conditioning” ritual is needed.
How to make the new battery last
Avoid heat, use a good charger, and avoid draining to zero. We list all of this in our guide on making a battery last longer.
Visit Junaid Telecom
Bring your phone or send its model on WhatsApp. Junaid Telecom & Repairing Lab, Madrasa Banat Road, Mohalla Garah, Dhol Sikandar, Chiniot. Open daily 8:00 AM to 9:00 PM.
- Repairing Lab WhatsApp: 0345 7599995
- Owner WhatsApp: 0345 7701965
- Staff WhatsApp: 0348 8651965