The iPhone 12 Pro Max, as the most advanced model in the iPhone 12 series, features the largest battery in that generation of phones. Despite being designed for long-lasting performance, its battery also loses capacity over time. If you notice your phone draining faster or needing more frequent charging, it's time for a professional battery replacement at our shop. The iPhone 12 Pro Max comes with a battery of approximately 3687 mAh, which is significantly more than the standard models in the same series. This larger battery provides up to 20 hours of video playback, making it ideal for heavy phone users. However, precisely because of its size and complexity, replacing this battery requires special care and experience. With Pro Max models, we frequently encounter specific issues such as unexpected shutdowns at low temperatures, slower charging, or even overheating during use. These symptoms usually indicate that the battery has reached the end of its lifespan and needs to be replaced. Apple implemented an advanced battery management system in the iPhone 12 Pro Max that optimizes performance based on user habits. When the battery degrades, this system may begin throttling processor performance to prevent unexpected phone shutdowns. Our team of technicians with twenty years of experience approaches iPhone 12 Pro Max battery replacement methodically and carefully. The process begins with a thorough diagnostic where we check the current Battery Health, battery capacity, and the overall condition of the phone. This analysis allows us to determine whether the problem is actually the battery or possibly another component.To open the iPhone 12 Pro Max, we use specialized tools and techniques that leave no marks on the phone's housing. We pay special attention to the cameras and sensors, as this model relies on precise calibration of its Pro features. The old battery is carefully removed, and a new premium battery is installed with full system calibration.We use exclusively batteries from verified suppliers whose capacity is equal to or greater than the original Apple battery. After installation, Battery Health will show 100%, and the phone will perform like new. The entire procedure takes about one hour, during which you can wait at our shop or come back when it's done. The price of a battery replacement for the iPhone 12 Pro Max starts from 7.000 RSD and includes the premium battery, professional installation, diagnostics, and testing of all phone functions. Considering that the iPhone 12 Pro Max remains a top-tier phone with excellent cameras and performance, this investment will allow you to keep using it for several more years without issues.We provide a 90-day warranty on the service performed. Our warranty covers both the battery quality and the quality of installation, giving you complete confidence in our service. Viper Mobile is located at Bulevar Arsenija Čarnojevića 91/3 in New Belgrade. For information and appointment scheduling, call 065/362-61-31. Given the complexity of the iPhone 12 Pro Max model, we recommend booking your appointment in advance.
Price List
Aftermarket (premium)
For those who want a reliable replacement at the best price.
- Warranty: 90 days
- In Settings: Battery Health works normally; Parts & Service History shows “Used”, no pop-up warnings.
- Lowest price
- Full capacity, same as the original
- Service history shows “Used” (informational)
This is how it looks in the phone’s Settings. The label is informational only — it does not affect how the phone works.JCID High-Capacity
For those who value battery life over the label in Settings.
- Warranty: 90 days
- In Settings: Battery Health works normally; Parts & Service History shows “Used”, no pop-up warnings.
- Capacity 8–10% above the original
- Longest battery life per charge
- Service history shows “Used” (informational)
This is how it looks in the phone’s Settings. The label is informational only — it does not affect how the phone works.Genuine Apple (Original)
For those who want factory condition and the longest warranty.
- Warranty: 180 days (6 months)
- In Settings: Genuine — original Apple part, no warnings.
- Original Apple part, factory condition
- Apple part configuration on the phone itself
- Highest price
This is how it looks in the phone’s Settings. The label is informational only — it does not affect how the phone works.Note: if the back cover is cracked, the battery warranty does not apply — a shard of glass can fall inside and puncture the new battery. If we replace the cover during the same visit, the battery keeps its full warranty.
Battery photos
Aftermarket (premium)
JCID High-Capacity
Genuine Apple (Original)
Configuration of genuine Apple parts
Genuine Apple screens and batteries go through Apple configuration (calibrating the part with the device) — a process started on the phone itself that takes a few minutes.
Frequently Asked Questions About Battery Replacement
How do I know if I need a new iPhone battery?
Check Battery Health in Settings → Battery → Battery Health. If it's below 80%, replacement is recommended. Other signs include: phone shutting down at 20-30%, rapid draining, and slow charging.
How long does iPhone battery replacement take?
iPhone battery replacement takes 1 to 2 hours depending on the model.
Will I lose my data during iPhone battery replacement?
No. Battery replacement does not affect your data, photos, apps, or settings on your iPhone. We never erase anything and never ask for your unlock code.
Is the iPhone battery original?
Yes. For iPhone 12 and newer, we use original batteries from the authorized Apple distributor that display 'Genuine Apple' status and Battery Health percentage in settings. For older models, we offer premium high-capacity batteries.
How long does a new iPhone battery last?
An original Apple battery typically retains over 80% capacity during the first 2 years of normal use (approximately 500 charge cycles). Exact lifespan depends on usage patterns.
What is the warranty on an iPhone battery replacement?
Genuine Apple (original) batteries: 6-month warranty. Premium replacement and JCID Enhanced batteries: 90 days (3 months). One exception: if the phone's back cover is cracked at the time of installation, the battery warranty does not apply — a shard of glass can fall inside and puncture the new battery. That is why we suggest replacing the cover during the same visit; the battery then keeps its full warranty. The exception applies to the battery only — all other installed parts keep their regular warranty periods.
We send a courier to pick up your phone and return it repaired. Available across Belgrade.
1,500 RSD
Hydrogel Screen Protection
With every repair — hydrogel film at a special price of 2,000 RSD. Protects against scratches and minor impacts.
2,000 RSD
Related Services
Our repair shop is located in New Belgrade — phone repair New Belgrade