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Black rectangular lithium-ion battery with gold contacts and small tool kit components beside it

SZYG

SZYG 4400 mAh 3.8 V cell phone battery for iPhone 12 Pro Max with tool kit

SKU CH-3R99-PFFKM

Replacement lithium-ion cell rated at 4400 mAh and 3.8 V for the iPhone 12 Pro Max, bundled with a complete tool kit for straightforward installation

  • Total capacity4,400 mAh
  • Compatible phone brandsApple
  • Compatible phone modelsiPhone 12 Pro Max
  • Battery chemistryLi-Ion
  • Voltage3.8 V
  • Product typeBattery Kit
  • Higher capacity extends usage between charges with a 4410 mAh cell
  • Certified safety protections prevent overheating and overcharging via built-in smart chip
  • Complete tool kit and instructions enable straightforward self-installation
  • Brand new zero-cycle lithium-polymer cell delivers reliable long-term performance
  • Direct compatibility with iPhone 12 Pro Max ensures proper fit and function

Replacement battery kit for iPhone 12 Pro Max

This 4400 mAh lithium-ion cell operates at 3.8 V and is designed specifically for the iPhone 12 Pro Max. The kit includes a full set of removal tools, adhesive strips and step-by-step instructions so that a non-professional can complete the swap at home. It targets owners whose original pack no longer holds a useful charge.

Sustained discharge and cycle life

The manufacturer rates the cell at 4410 mAh, which is higher than the 3310 mAh figure cited for the original Apple component, so the replacement should deliver longer run-time between charges. A built-in smart chip manages over-charging, over-discharging and short-circuit protection during extended use. The pack ships at zero cycles and carries ISO 9001, FCC, CE, MSDS, UL and UN 38.3 certifications.

Thermal behaviour and safety margins

The integrated protection circuit limits temperature rise by cutting power if the cell approaches unsafe heat levels, preventing over-heating in normal daily workloads. No active cooling is required and the slim lithium-polymer profile fits the existing chassis without modification. Power draw remains within the phone's original design envelope, so the stock charger and logic board handle the load without extra stress.

How it compares

Measured against everything we stock in Replacement Phone Batteries, at today’s prices. Recalculated every night.

Price $20.99
Pricier than about 82% of the 868 comparable items (median $14.99).

Specifications

Product
Total capacity4,400 mAh
Product typeBattery Kit
Product colorBlack
Power
Battery chemistryLi-Ion
Voltage3.8 V
Compatibility
Compatible phone brandsApple
Compatible phone modelsiPhone 12 Pro Max

Questions about this item

Does the 4400 mAh battery generate noticeable heat during all-day use?

The built-in smart chip prevents over-heating, short-circuit, over-charging and over-discharging for safe prolonged use.

What tools do I already need to install this battery kit?

The kit includes a full removal tool kit, adhesive and instructions so no extra tools are required.

Will this 3.8 V cell work with the original iPhone 12 Pro Max charging circuit?

Yes, it is designed as a direct replacement for the iPhone 12 Pro Max and matches the original voltage specification.

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