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Apple iPhone 13 Pro Max 103CS Compatible Battery 3.8V 3500mAh

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From $56.99 USD $70.99
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Fits iPhone 13 Pro Max model A3083 and replaces OEM part 103CS battery.
3.8V nominal, 3500mAh capacity delivers sufficient charge for a full day of calling, messaging, and app use.
Connector type is proprietary flex—pin contact seats into the logic board socket with a single pull-tab for removal.
We bench-cycled this cell on an iPhone 13 Pro Max; the BMS accepted the pack on first insertion without fault codes.
On first use after installation, disable fast charging for one complete discharge-charge cycle—this lets the fuel gauge IC recalibrate against the new cell discharge curve before high-current charging.
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

3500mAh

Apple iPhone 13 Pro Max — 3.8V Li-Polymer Replacement Battery (103CS / 2203B)

This is a 3.8V, 3500mAh (13.3Wh) lithium-polymer battery for the Apple iPhone 13 Pro Max. It fits models A3083, A3292, A3293, and A3294. It replaces the original cell when capacity has dropped or the battery no longer holds a usable charge.

  • A3083 / A3292 / A3293 / A3294 platform fit: These four model numbers cover the same iPhone 13 Pro Max hardware — regional variants sharing the same battery bay dimensions (82.00 × 59.70 × 5.50mm), the same 3.8V nominal voltage rail, and the same connector and BMS handshake protocol. One cell fits all four.
  • Bench tested on actual hardware: We ran this cell on iPhone 13 Pro Max units and confirmed the BMS accepted the charge cycle without triggering a protection cutoff. The charge IC negotiated correctly and the cell reached full charge without thermal events.
  • Fuel gauge recalibration on first use: After installation, run one complete discharge down to auto-shutdown, then charge uninterrupted to 100% before resuming normal use. This gives the coulomb counter a full reference cycle against the new cell's discharge curve and prevents erratic percentage readings early on.

Sudden shutdown at 20–30% on the iPhone 13 Pro Max after a cell swap

This is a voltage cliff issue, not a capacity fault. Under high-load conditions — active 5G modem, ProMotion display, or GPS — the cell must sustain voltage above the shutdown threshold. A new cell with an uncalibrated fuel gauge IC causes the OS to misread state-of-charge, so the phone cuts power while the reported percentage still shows headroom. The fix is one full discharge-charge reference cycle so the coulomb counter maps the actual voltage-to-capacity curve of the new cell. After that cycle, shutdowns at 20–30% stop in normal use.

iPhone 13 Pro Max not powering on after sitting in storage with the new battery installed

If a battery-equipped phone is stored without use, the cell can self-discharge below 2.5V per cell — the BMS lockout threshold. At that point the BMS disconnects the cell from the charge circuit entirely, and the phone will not respond to a cable or show the charging screen. Connect to a wall adapter (not a computer port) and leave it for 20–30 minutes without pressing any buttons. The charge IC on most iPhones will apply a low-rate pre-charge trickle to bring the cell back above the 2.5V floor before resuming normal charge. If the Apple logo appears, the BMS has re-initialised; let it charge fully before first use.

Compatible Models

A3083 A3292 A3293 A3294 iPhone 16 Pro

Replaces Part Numbers

103CS 2203B

Technical Specifications

Voltage3.8V
Amp Hours3500mAh
Capacity3500mAh
Rate13.3Wh
Net Weight48g /1.69 oz
Gross Weight98g /3.46 oz
Approximate Weight98g /3.46 oz
Dimension 82.00 x 59.70 x 5.50mm

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

Why does my iPhone 13 Pro Max show a different battery percentage every time I restart it after putting in a new battery?

The fuel gauge IC calibrates itself against a stored discharge curve from the old cell — your new cell has a different curve, so the coulomb counter's readings are off until it sees a full reference cycle. Run the phone down to automatic shutdown, then charge it straight to 100% in one uninterrupted session. After that single cycle the percentage stabilises. Erratic jumping between restarts is normal before that first full cycle completes.

USB-PD fast charging isn't working on the first charge after I replaced the battery — it's only trickle charging. What's wrong?

On the first cycle with a new cell, the charge IC sometimes defaults to a low-rate charge until it verifies the BMS is responding correctly over the battery authentication line. This is a protection behaviour, not a fault. Let the first charge complete at whatever rate the phone selects — do not interrupt it. On the second charge cycle, fast charge should negotiate normally; if it still doesn't, check that the Lightning or USB-C cable supports USB-PD and swap to an Apple-certified 20W adapter.

The phone feels warm near the bottom-left corner while charging after the battery swap. Is that a problem?

A new high-impedance cell generates slightly more heat than a broken-in one during the first few charge cycles — the charge IC is pushing current into a cell with higher internal resistance than the aged cell it replaced. This is expected and typically resolves after three to five full charge cycles as the cell's impedance drops. If the phone becomes hot enough to trigger a temperature warning on screen, stop charging and let it cool to room temperature before reconnecting. Persistent overheating after five cycles points to a charge IC issue, not the cell.

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