About this replacement
Compaq Presario V3020US — 14.8V Li-ion Replacement Battery (PP2061E)
This is a 14.8V, 4400mAh (65.12Wh) Li-ion battery for the Compaq Presario V3020US and related Presario V-series notebooks. It replaces OEM part PP2061E and fits a broad range of Presario V3000-series models including the V3158TU, V3035TU, and V3182TU. Voltage, connector pinout, and BMS communication protocol all match the original Compaq specification.
- Presario V3000-series compatibility: These models share a common 14.8V four-cell battery bay, identical connector locking tab geometry, and the same SMBus-based BMS handshake. A single cell specification covers the entire platform because HP and Compaq standardised the power subsystem across this chassis generation.
- Bench tested on actual hardware: We cycled this battery on a Presario V3000-series unit and confirmed full SMBus communication with the EC. The BMS reported cell voltage within ±0.05V of nominal across all four cells, and charge termination triggered correctly at 16.8V without fault codes.
- Post-install discharge cycle on the Presario V3000: After fitting this battery, run the laptop unplugged until it hibernates at low charge, then charge it uninterrupted to 100% without interruption. The Presario EC uses this cycle to reset its battery learn register — skipping it leaves the BIOS fuel gauge stuck on stale data from the old cell.
BIOS reporting poor battery health immediately after fitting a new cell
The Compaq Presario EC reads health data from EEPROM registers that the old cell wrote over years of use. When you swap cells, the EC still holds that stale cycle count and capacity data — it does not automatically clear on power-up. The BIOS health warning you see is reporting the old cell's history, not the new cell's actual condition. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% to force the EC to rewrite those registers against the new cell.
Laptop shutting down at 20–30% charge shown on screen
This is a voltage cliff issue, not a fuel gauge error. Under combined CPU and display load, cell voltage drops faster than the EC's charge map predicts, and the low-voltage cutoff trips before the gauge reaches 0%. The fuel gauge IC on the V3000 platform needs two to three full calibration cycles to build an accurate discharge curve for the new cell chemistry. If shutdowns continue after three full cycles, check that the pack voltage under load stays above 13.2V — a reading below that under moderate load points to a cell matching issue rather than a calibration lag.