Compaq Presario A900 10.8V Replacement Battery 436281-241
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Compaq Presario A900 10.8V Replacement Battery 436281-241 - 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
⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.
🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Compaq Presario A900 10.8V Replacement Battery 436281-241 - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
4400mAh
Compaq Presario A900 / C700 Series — 10.8V Li-ion Replacement Battery (436281-241)
This 10.8V, 4400mAh Li-ion battery replaces the original pack in the Compaq Presario A900 and C700 series notebooks. It covers a broad range of models within those lines, all sharing the same voltage rail and connector format. OEM part numbers 452057-001, HSTNN-DB42, and HSTNN-LB42 are among the many cross-references this cell satisfies.
- A900 and C700 platform fitment: Both series run a common 10.8V three-cell-series architecture with the same physical connector and BMS handshake protocol. That shared design is why one cell covers both lines without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a Presario C700 unit. The BMS negotiated correctly, charge termination triggered at the expected voltage ceiling, and no fault codes were logged by the notebook.
- First-install discharge cycle on Presario units: After fitting, run the laptop on battery only until it hits hibernate cutoff — do not interrupt the cycle. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after fitting a new cell
The Presario BIOS reads health data from the battery's EEPROM on first contact. The new cell's EEPROM carries factory default figures that do not match the notebook's stored discharge history, so the system flags it as degraded before a single cycle has run. This is a data mismatch, not a fault with the cell itself. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% and the BIOS learn cycle will rewrite its reference data against the new cell's actual performance.
Laptop shuts down abruptly while the gauge still shows 20–25% remaining
This happens when the fuel gauge IC has not yet calibrated against the new cell's chemistry. The IC is still using charge-curve data from the old, degraded pack, so its percentage estimate diverges from actual cell voltage under load. When the CPU and display draw peak current simultaneously, the cell voltage drops past the BMS cutoff threshold before the gauge has counted down to zero. Run two to three full discharge-and-charge cycles without interruption — by the third cycle the fuel gauge IC will have recalibrated and the shutdown should move to below 5% remaining.
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 A900 shows "0% available (plugged in, charging)" and never moves — what's wrong?
The BIOS lost contact with the battery's EEPROM data during the swap and is reading the cell as unknown. Shut down completely, remove the AC adapter, reseat the battery firmly, then boot with the charger connected. If the gauge still reads 0%, perform a full discharge to hibernate cutoff followed by an uninterrupted charge to 100% — that forces the BIOS learn cycle to reinitialise against the new cell's data.
The Presario C700 says the battery Wh rating is wrong compared to what the product listing shows — is the cell faulty?
It is not a fault. The EEPROM in the replacement cell stores the rated Wh figure from the cell manufacturer's specification, which can differ slightly from the value HP originally programmed into the platform's reference data. The actual energy capacity of the cell is correct at 47.52Wh — the discrepancy is a labelling difference between EEPROM firmware versions. Run a full calibration cycle and the reported figure will typically align closer to the rated value once the fuel gauge IC measures real charge throughput.
Charge stops at around 80% on the Presario A900 and will not go higher — is this a battery problem?
This is almost always a BIOS-controlled charge limit, not a cell fault. Some Presario BIOS versions activate a charge threshold feature that caps charging at 80% to reduce heat during long AC sessions — it is a firmware setting, not a hardware failure. Check the HP Power Manager utility or the BIOS power settings for a "battery charge threshold" or "optimised battery charging" option and disable it. After turning it off, the next charge cycle should run to 100%.
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