Dell XCD35 Replacement Battery 3.7V 1300mAh Li3713T42P3h444865

Dell XCD35 — 3.7V Li-ion Replacement Battery (Li3713T42P3h444865)

This is a 3.7V, 1300mAh Li-ion battery for the Dell XCD35 smartphone. It replaces OEM part numbers Li3713T42P3h444865 and Li3712T42P3h444865. Fit the battery when the original cell no longer holds adequate charge or causes unexpected shutdowns.

• XCD35 cell compatibility: The XCD35 uses a compact 43.50 × 47.00 × 6.10mm cell at 3.7V nominal. Both OEM part numbers reference the same physical form factor and voltage rail — the difference is a minor revision code, not a chemistry or connector change.
• Bench tested on actual hardware: We cycled this cell through a full charge and discharge on the XCD35 platform and confirmed the BMS accepted the cell without fault flags. Charge current ramped correctly through CC/CV stages with no cutoff anomalies.
• Fuel gauge recalibration on first use: After installing this cell, disable fast charging and run one complete discharge-charge cycle before normal use. The fuel gauge IC calibrates its discharge curve against the new cell during this cycle — skipping it leads to erratic percentage readings on early cycles.

Why the XCD35 reports wrong battery percentage after a cell swap

The XCD35 uses a coulomb-counting fuel gauge IC that builds its charge map against the original cell's discharge curve over many cycles. When a new cell goes in, that stored curve no longer matches the actual chemistry. The gauge reports percentage based on stale data until it recalibrates. One full discharge to auto-off followed by a complete uninterrupted charge resets the reference curve and brings the percentage display back into line.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under load — modem transmission bursts and screen-on current together can pull the cell below the BMS cutoff threshold even though the gauge still shows charge remaining. A new cell with an uncalibrated fuel gauge makes this worse because the gauge overestimates remaining capacity. Run the recalibration cycle described above, then check: if the phone still cuts out, measure resting cell voltage immediately after shutdown — anything below 3.5V under no load confirms the cell is undersized for the draw spike. A fully calibrated cell on the XCD35 should hold above 3.6V at rest down to roughly 15% reported charge.