Doro 8080 Replacement Battery DBU-3200A 3.85V 3200mAh

Doro 8080 / 8050 / DSB-022 — 3.85V Li-Polymer Replacement Battery (DBU-3200A)

This is a 3.85V, 3200mAh Li-Polymer cell built to fit the Doro 8080, 8050, and DSB-022 smartphones. These are senior-focused handsets with simplified Android interfaces and large displays. If your original DBU-3200A has swollen, drains fast, or no longer holds a charge through a normal day, this cell replaces it directly.

• 8080, 8050, and DSB-022 compatibility: All three models run the same 3.85V battery rail and use the same DBU-3200A form factor — same connector pinout, same cell footprint at 81.00 × 63.70 × 3.70mm, and same BMS handshake with the charge IC on the motherboard.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the 8080 platform. The BMS accepted the cell without error flags, the charge IC stepped through trickle, bulk, and top-off phases correctly, and the fuel gauge IC logged the full 3200mAh nominal capacity.
• First-cycle fuel gauge reset: After fitting this cell, disable fast charging in settings and run one full discharge-to-charge cycle at standard rate. This gives the fuel gauge IC one clean pass to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter.

Why the Doro 8080 reports wrong battery percentage after a cell swap

The 8080 uses a coulomb-counting fuel gauge IC that builds its charge model from the original cell's discharge curve over many cycles. When you fit a fresh 3200mAh cell, the IC is still referencing the old, degraded curve — so it reports percentage against the wrong baseline. The result is a reading that may show 100% shortly after fitting but drop sharply under any load. One complete discharge below 10% followed by a full charge to 100% at standard rate resets the IC's reference curve. After that cycle, percentage reporting stabilises and the gauge tracks the new cell accurately.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity issue. Under high-draw events — LTE modem active, screen at full brightness, or GPS running — the cell's terminal voltage drops below the BMS cutoff threshold faster than the fuel gauge anticipates, triggering an immediate shutdown even though the reported percentage still looks healthy. It happens most often in the first few cycles before the fuel gauge IC has recalibrated. Run the full calibration cycle first: discharge to automatic shutdown, then charge uninterrupted to 100%. If shutdowns continue past three cycles, check that cell voltage at rest is sitting above 3.7V before you start a heavy-use session.