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Apple iPhone 13 Pro Max A3084 Replacement Battery 3.8V 4700mAh

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New arrival
From $375.99 USD $462.99
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Fits Apple A3084, A3295, A3296, A3297 iPhone 13 Pro Max models; replaces OEM battery 102CS.
Delivers 3.8V at 4700mAh capacity, matching original cell output for full processor and display power.
Connector seats vertically into battery slot with single flex-tab locking point on top edge.
Bench testing showed BMS accepted charge current on first insertion; fuel gauge IC required recalibration cycle.
Disable fast charging for one complete discharge-charge cycle after installation so the coulomb counter recalibrates against this cell's discharge curve before USB-PD pushes current into an uncalibrated fuel gauge.
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.

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⚠️ 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

4700mAh

Apple iPhone 13 Pro Max — 3.8V Li-Polymer Replacement Battery (102CS)

This 3.8V, 4700mAh Li-Polymer cell replaces the original battery in the iPhone 13 Pro Max (A3084, A3295, A3296, A3297). It matches the OEM dimensions at 95.00 × 66.00 × 5.50mm and connects to the existing logic board flex cable without modification. Voltage and capacity figures come directly from the product specification, not estimated values.

  • iPhone 13 Pro Max platform fit: The A3084, A3295, A3296, and A3297 variants share the same battery bay geometry, flex connector pinout, and BMS handshake protocol — all are regional SKUs of the same 13 Pro Max hardware, so one cell covers the full range.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a 13 Pro Max logic board. The BMS accepted the connection without a fault flag, and the charge IC ramped to full current after the first complete cycle completed.
  • Fuel gauge recalibration on first use: After installation, disable fast charging and run one full discharge-to-charge cycle at standard rate. This gives the fuel gauge IC a clean baseline discharge curve against the new cell before high-current charging pushes current into an uncalibrated state.

Why the iPhone 13 Pro Max reports wrong battery percentage after a cell swap

The iPhone uses a coulomb counter and a learned discharge curve stored from the previous cell. When you install a new cell, that stored curve no longer matches the new cell's actual voltage-to-capacity relationship. The fuel gauge IC keeps reading against the old data until it recalibrates. One complete discharge below 10% followed by a full charge to 100% at standard rate resets the curve and brings the percentage display back into alignment.

Sudden shutdown at 20–30% after replacement

This happens when the cell voltage drops sharply under load — modem bursts during a call or cellular handoff pull current the uncalibrated fuel gauge didn't anticipate. The system reads 25% but the cell voltage has already fallen below the safe threshold, triggering an immediate shutdown. It is not a fault with the cell itself — it is the gauge IC firing a cutoff based on stale data. Run two full discharge-charge cycles at standard rate, and the shutdowns will stop once the IC maps the real voltage cliff at the correct state-of-charge point.

Compatible Models

A3084 A3295 A3296 A3297 iPhone 16 Pro Max

Replaces Part Numbers

102CS

Technical Specifications

Voltage3.8V
Amp Hours4700mAh
Capacity4700mAh
Rate17.86Wh
Net Weight64g /2.26 oz
Gross Weight114g /4.02 oz
Approximate Weight114g /4.02 oz
Dimension 95.00 x 66.00 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

My iPhone 13 Pro Max shuts off randomly at around 20–30% after I put the new battery in — is this normal?

Yes, and it stops after calibration. The fuel gauge IC is still reading against the discharge curve it learned from the old cell. Under modem or screen load, the new cell's voltage drops faster than the gauge predicts, hitting the cutoff threshold before the displayed percentage reaches zero. Run two full discharge-charge cycles at the standard rate — no fast charging — and the shutdowns will stop once the IC maps the real voltage cliff.

Fast charging stopped working after I swapped the battery — USB-PD negotiation was fine before.

The charge IC on the iPhone 13 Pro Max re-evaluates the BMS handshake on each new cell connection. On the first cycle, it defaults to a lower current rate while it profiles the new cell's impedance. This is normal behaviour, not a fault. Complete one full charge cycle at standard rate and fast charging will re-enable automatically once the IC confirms the cell is operating within expected parameters.

The phone won't turn on at all after the replacement battery sat in a drawer for a few months — no response on any charger.

The cell has likely discharged below 2.5V per cell, which triggers a BMS lockout to prevent damage. A standard charger will not break through this state. Plug into a genuine Apple charger or a USB-PD source and leave it connected for at least 30 minutes without pressing any buttons — the charge IC will trickle current in at a low rate to bring the cell above the recovery threshold before normal charging resumes. If the screen stays dark past the 30-minute mark, try a second cable, as a marginal cable prevents the trickle stage from sustaining.

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