Compaq Presario V3020US Replacement Battery 14.8V 4400mAh
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Compaq Presario V3020US Replacement Battery 14.8V 4400mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Compaq Presario V3020US Replacement Battery 14.8V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
14.8V
Amp
4400mAh
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.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Compaq
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My Presario shows the replacement battery as "0% available (plugged in, not charging)" — what's happening?
The EC is failing to complete the SMBus handshake with the new cell's BMS on the first power-up cycle. Remove the AC adapter, pull the battery, hold the power button for 15 seconds to drain residual capacitor charge, then refit the battery and reconnect AC before powering on. This forces the EC to re-initialise the SMBus connection from scratch rather than resuming a broken session from the previous cell.
The Wh rating shown in Windows shows 47Wh for this battery, but the spec says 65.12Wh — is the cell faulty?
The Wh figure Windows displays is pulled from the EEPROM design capacity register, which still holds the old cell's rated value until the battery learn cycle completes. The new cell's actual chemistry is 65.12Wh — that is the authoritative figure from the cell specification. Run one full discharge-to-hibernate cycle then charge to 100% uninterrupted, and the EC will rewrite the design capacity register to reflect the installed cell.
After three weeks of use the fuel gauge is still jumping — reads 60%, then skips to 35% without warning. What resets it?
The fuel gauge IC on the Presario V3000 platform calibrates its discharge curve incrementally across multiple full cycles. Three to five complete discharge-to-hibernate-then-full-charge cycles are typically needed before the curve stabilises against a new cell. Each partial discharge or mid-cycle recharge resets that learning process and extends the calibration period. Run the laptop unplugged to hibernate cutoff each evening for a week, then charge fully overnight without interruption, and the gauge skipping should stop.
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