About this replacement
Apple iPhone 13 — 3.85V Li-Polymer Replacement Battery (616-00258)
This 3.85V Li-Polymer cell is a direct swap for the original battery in the iPhone 13, iPhone 13 5G, and A2635 variants. Capacity is 3200mAh (12.32Wh), matching OEM cell specifications. It fits the standard battery bay with the same footprint: 88.80 × 44.60 × 4.90mm.
- iPhone 13 and 13 5G compatibility: Both models share the same logic board power rail, battery connector pinout, and BMS handshake protocol — this cell covers both without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an iPhone 13 board. The BMS accepted the cell, the fuel gauge IC initialised correctly, and charge current ramped as expected through both trickle and CC/CV phases.
- First-cycle fast charge protocol: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current fast charging pushes current into an uncalibrated cell.
Sudden shutdown at 20–30% on the replacement cell
This is a voltage cliff problem, not a capacity problem. When the modem fires a transmission burst or the display scales brightness, current draw spikes sharply. If the fuel gauge IC is still calibrated to the old cell's discharge curve, it misreads state-of-charge and the protection circuit trips before the percentage reaches zero. Running one full discharge-to-cutoff cycle — letting the phone shut off naturally — gives the coulomb counter a clean reference point. After that cycle, shutdowns at partial charge should stop.
Phone not powering on after the new cell sat in storage
Li-Polymer cells self-discharge in storage. If the cell voltage has dropped below approximately 2.5V, the BMS enters lockout mode and blocks charge current entirely. The phone will show nothing — no charging screen, no Apple logo. Connect to a genuine Apple adapter and leave it undisturbed for 20–30 minutes; the BMS needs a low-current trickle to recover the cell voltage above the lockout threshold before normal charging resumes. Once the cell crosses roughly 3.0V, the BMS releases and the phone will boot.