Battery Management System — the small circuit board bonded to the battery tabs. It protects the cell against over-charge, over-discharge and short circuit, and reports capacity and cycle data to the phone.

Will the phone show a battery warning with a replacement BMS?

Usually yes. A new board has not been authenticated by Apple for that phone, so iOS shows the "Important Battery Message" notice and hides Battery Health. Reusing the customer's original board is what avoids it — a replacement board is for when the original is physically damaged.

Do I need a spot welder?

It is strongly preferred. Prolonged iron heat on battery tabs risks damaging the cell, and a weak joint on a battery tab is a fire risk.

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BMS Cable 13 Pro Max

Name: BMS Cable 13 Pro Max
SKU: DFX-13PM-BMS
Price: 670 PKR
Availability: InStock

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The BMS cable for the iPhone 13 Pro Max — the small battery management board with its connector flex, the piece that sits on the battery tabs and reports to the phone.

Rs 670

The BMS cable for the iPhone 13 Pro Max — the small battery management board with its connector flex, the piece that sits on the battery tabs and reports to…

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The BMS cable for the iPhone 13 Pro Max — the small battery management board with its connector flex, the piece that sits on the battery tabs and reports to the phone.

Key features

Pairs with a bare battery cell to rebuild a complete pack
Replaces a BMS damaged by liquid, corrosion or a torn flex
Model-specific flex length and connector position for the iPhone 13 Pro Max

What this is used for

Rebuilding a battery from a bare cell
Replacing a BMS board damaged by liquid or corrosion
Repairing a torn or broken battery connector flex

Who it's for

Technicians rebuilding battery packs who are equipped to spot weld.

Where it fits in the repair

Spot weld or transfer the board onto the cell tabs observing polarity, insulate the joint with Kapton, then seat the rebuilt pack and route the flex exactly as the original ran.

Manufacturer description

The BMS cable for the iPhone 13 Pro Max — the small battery management board with its connector flex, the piece that sits on the battery tabs and reports to the phone. • Pairs with a bare battery cell to rebuild a complete pack • Replaces a BMS damaged by liquid, corrosion or a torn flex • Model-specific flex length and connector position for the iPhone 13 Pro Max Compatible with: iPhone 13 Pro Max.

Repair guides

Browse the DeepFix repair guides for buying advice and step-by-step repair walkthroughs.