AT&T Status 3.7V Replacement Battery 35H00155-00M 1200mAh

AT&T Status — 3.7V Li-ion Replacement Battery (35H00155-00M)

This 3.7V, 1200mAh Li-ion cell is a direct replacement for the AT&T Status smartphone. It fits the compact messaging-focused handset and restores power when the original cell can no longer hold a usable charge. Cross-references include 35H00156-00M, BA S570, and BH06100.

• Status platform fit: The Status uses a single-cell 3.7V Li-ion pack with a three-contact connector carrying positive, negative, and a thermistor line the charge IC monitors for thermal safety. Any replacement must match that contact layout — mismatched pinouts trigger an immediate charge cutoff.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Status platform. The BMS accepted the cell without fault codes, the thermistor line read within spec, and charge termination triggered correctly at 4.2V.
• Fuel gauge recalibration on first use: On first installation, run the battery down to automatic shutdown, then charge uninterrupted to 100% before use. The Status fuel gauge IC calibrates its coulomb counter against a full discharge curve — skipping this step leaves the percentage reading inaccurate for days.

Why the Status reports wrong battery percentage after a cell swap

The Status uses a fuel gauge IC that tracks charge state by counting coulombs relative to a stored discharge curve. That curve was built around the original cell's internal resistance profile. A new cell has a different impedance characteristic, so the IC's percentage estimate drifts — sometimes by 20% or more. One full discharge-to-shutdown followed by an uninterrupted charge to 4.2V forces the IC to rewrite its reference curve against the new cell. After that single cycle, percentage accuracy normalises.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens when the fuel gauge IC still holds the old cell's voltage-to-capacity curve in memory. The original degraded cell had a steep voltage cliff at low charge, and the IC learned to cut power early to protect it. With a fresh cell, that cutoff triggers prematurely because the stored curve no longer matches real cell behaviour. Run one complete discharge cycle to automatic shutdown, then charge to full without interruption. After recalibration, the IC tracks the new cell's flatter discharge curve and the early shutdowns stop.