Sony Xperia 1 Global LIP1701ERPC Replacement Battery 3.85V 2900mAh

Sony Xperia 1 Global / J8110 / J9150 — 3.85V Li-Polymer Replacement Battery (LIP1701ERPC)

This 3.85V, 2900mAh Li-Polymer cell replaces the OEM LIP1701ERPC (also listed as 1315-7600) in the Sony Xperia 1 Global, J8110, PF13, J9150, and related variants. It fits the same physical footprint — 76.45 × 52.04 × 4.40mm — and connects to the same flex connector on the main board. Capacity matches the factory spec at 11.17Wh.

• Xperia 1 platform compatibility: The J8110 (single-SIM), J9150 (dual-SIM), and PF13 variants all run on the same power rail and share the identical connector orientation and BMS handshake — one cell fits across the range without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on an Xperia 1 board, confirmed BMS communication was accepted, and verified the charge IC stepped through trickle, CC, and CV phases without fault codes or thermal interruption.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging for one complete discharge-charge cycle. The Xperia 1's fuel gauge IC holds the old cell's discharge curve in memory — running one slow cycle lets it recalibrate against the new cell before high-current charging resumes.

Sudden shutdown at 20–30% on the Xperia 1 after a cell swap

This happens because the fuel gauge IC is still using the discharge curve mapped to the degraded original cell. When the new cell's actual voltage drops under modem transmit load or display brightness spikes, the IC misreads remaining capacity and the system shuts down to protect the board — even though the cell isn't truly empty. One full slow discharge-to-shutdown followed by a complete charge resets the coulomb counter against the new cell's curve. After that cycle, the reported percentage tracks the actual cell state accurately.

USB-PD fast charge not activating on the first cycle after replacement

On the first charge after fitting a replacement cell, the Xperia 1's charge IC sometimes defaults to standard 5V input rather than negotiating the higher USB-PD voltage. This occurs because the BMS on the new cell starts cold — it hasn't yet confirmed cell temperature and internal resistance to the charge IC, so the IC falls back to a safe low-current mode. Disconnect the cable, wait 30 seconds, and reconnect — this forces a fresh USB-PD handshake. If fast charge still doesn't engage, complete one full standard charge cycle first; the IC will accept PD negotiation on the next session once it has a baseline cell reading.