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Apple iPhone 15 Pro Max A3082 Replacement Battery 3.8V 4650mAh

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From $406.99 USD $500.99
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Fits Apple iPhone 15 Pro Max model A3082, replaces OEM battery part NA247.
Voltage is 3.8V at 4650mAh capacity — restores full charge cycles on a device experiencing battery health decline below 80%.
Connector attaches to the iPhone logic board via flex cable; adhesive strip secures the cell in the lower case cavity.
We bench-tested this cell against the A3082 fuel gauge IC on iOS 17 — BMS accepted the pack without fault codes on first insertion.
On first use after installation, disable fast charging for one complete discharge-charge cycle so the coulomb counter recalibrates against the new cell curve before USB-PD pushes current into an uncalibrated cell.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.8V

Amp

4650mAh

Apple iPhone 15 Pro Max — 3.8V Li-Polymer Replacement Battery (NA247)

This 3.8V, 4650mAh (17.67Wh) Li-Polymer cell replaces the original battery in the iPhone 15 Pro Max. It fits models A3082, A3289, A3290, and A3291. Install it when your original cell has degraded below usable battery health, or when the phone shuts down unexpectedly under load.

  • iPhone 15 Pro Max model variants: The A3082, A3289, A3290, and A3291 model numbers reflect regional hardware variants of the same iPhone 15 Pro Max chassis. They share the same battery bay dimensions, connector pinout, and BMS handshake protocol — this cell fits all of them.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the iPhone 15 Pro Max platform. The BMS accepted the cell without rejection flags, charge current stepped correctly through trickle, CC, and CV phases, and the coulomb counter initialised on the first full cycle.
  • First-cycle fuel gauge reset: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard speed. This lets the fuel gauge IC map the new cell's discharge curve before iOS locks in its capacity estimate — skipping this step is the main cause of erratic percentage readings post-swap.

Sudden shutdown at 20–30% on the iPhone 15 Pro Max after a battery swap

The iPhone 15 Pro Max pulls hard current spikes from the cell during 5G modem bursts and ProMotion display peaks. If the fuel gauge IC hasn't completed a full calibration cycle, iOS's voltage model is still mapped to the old cell's internal resistance curve. The new cell hits a voltage cliff the software didn't predict, and the phone shuts down to protect the SoC — even though charge remains. Run one full discharge to approximately 1–2% followed by a full charge at standard wattage. After that cycle, iOS recalibrates and the shutdowns stop.

USB-PD fast charging not engaging on the first cycle after replacement

After a cell swap, the charge IC on the iPhone 15 Pro Max starts the new cell in trickle mode regardless of what the charger offers. The BMS needs to confirm cell voltage is above the fast-charge entry threshold — typically 3.0V — before it signals the USB-PD controller to step up wattage. If the replacement cell shipped at low state of charge, this trickle phase can last longer than expected. Plug in, leave it connected, and fast charging will engage automatically once the cell clears the threshold; no reset or adapter change is needed.

Compatible Models

A3082 A3289 A3290 A3291 iPhone 16 Plus

Replaces Part Numbers

NA247

Technical Specifications

Voltage3.8V
Amp Hours4650mAh
Capacity4650mAh
Rate17.67Wh
Net Weight63g /2.22 oz
Gross Weight113g /3.99 oz
Approximate Weight113g /3.99 oz
Dimension 95.00 x 56.30 x 5.00mm

Product Highlights

  • Brand: Apple
  • Manufacturer: CS
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My iPhone 15 Pro Max shows the wrong battery percentage after fitting this replacement — jumping from 40% to 15% without warning. What's causing it?

The fuel gauge IC in the iPhone 15 Pro Max uses a coulomb counter calibrated to the discharge curve of the original cell. When a new cell goes in, that calibration is stale — the IC is predicting voltage drop based on a different cell's internal resistance profile. Run one full discharge down to automatic shutdown, then charge uninterrupted to 100% at standard wattage, not fast charge. After that single cycle the coulomb counter resets its model against the new cell and percentage readings stabilise.

The phone won't power on at all after the replacement battery sat in a drawer for a few months before installation. Is the cell dead?

Likely not dead — the BMS has tripped into lockout because the cell self-discharged below 2.5V during storage. At that voltage the protection circuit cuts all output to prevent cell damage. Plug the phone into a low-wattage charger — a standard 5W USB-A brick works better here than a high-wattage adapter — and leave it for 20–30 minutes without pressing any buttons. The charge IC will push trickle current past the lockout threshold, the BMS will release, and the phone will boot. If the Apple logo doesn't appear after 45 minutes of trickle charging, measure the cable and adapter with another device to rule out a dead charger.

The phone gets noticeably warm near the bottom-left corner during the first few charges after installation. Is something wrong with the new cell?

That warmth is coming from the charge IC working against a new cell with higher initial impedance than the aged cell it replaced. Fresh Li-Polymer cells have slightly elevated internal resistance out of storage, and the charge IC dissipates more heat while pushing current into a higher-impedance load. It's most pronounced in the first three to five charge cycles and tapers off as the cell conditions. If the chassis stays warm throughout a full charge rather than cooling once it hits the CV phase, check that no adhesive or foam from the installation is sitting against the cell — trapped heat has no path out and will trigger iOS thermal throttling.

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