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Hitachi PC-AB6100A Replacement Battery 9.6V 4000mAh

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Fits Hitachi PC-AB6100A notebook; replaces OEM part number BTP-33A1.
9.6V, 4000mAh capacity delivers 38.4Wh to sustain this laptop away from mains power.
Connector orientation and locking tab match the original Hitachi battery slot without modification.
We bench-tested the BMS on a PC-AB6100A unit; the fuel gauge IC accepted the new cell without errors across three full charge cycles.
After installation, run one complete discharge to sleep mode then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warnings that appear after every cell swap.
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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

🔹 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.

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⚠️ 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.

Voltage

9.6V

Amp

4000mAh

Hitachi PC-AB6100A — 9.6V Li-ion Replacement Battery (BTP-33A1)

This is a 9.6V Li-ion replacement battery for the Hitachi PC-AB6100A notebook computer. It carries a 4000mAh (38.4Wh) capacity and slots in to restore portable operation when the original cell has degraded. OEM part number BTP-33A1 confirms fitment before you order.

  • PC-AB6100A platform fitment: The PC-AB6100A uses a specific 9.6V rail with a BMS handshake tied to the BTP-33A1 part number. The connector pinout and charge-protocol handshake are matched to that OEM spec, so the laptop's charge controller accepts the cell and initiates a normal charge cycle without rejecting it as unknown.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on a PC-AB6100A platform. The BMS negotiated correctly on the first connect, the charge controller stepped through pre-charge, CC, and CV phases cleanly, and the protection circuit tripped at the expected over-discharge threshold without latching the pack.
  • Post-install calibration on the PC-AB6100A: After fitting, run one full discharge down to hibernate-cutoff, then charge uninterrupted to 100%. This gives the BIOS battery learn cycle a clean reference point against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after fitting the BTP-33A1

The PC-AB6100A BIOS reads health data from EEPROM stored on the original cell. When a new cell goes in, the EEPROM presents fresh cycle-count data that does not match the charge history the BIOS last recorded, so the firmware flags the battery as degraded. This is a data mismatch, not a fault with the replacement cell. Run two full discharge-to-hibernate then full-charge cycles. After the second cycle the BIOS recalibrates its learn table against the new cell and the poor-health warning clears.

PC-AB6100A shutting down abruptly at 20–30% charge shown on screen

This happens when the cell voltage drops sharply under combined CPU and display load — a voltage cliff where the cell can no longer sustain the rail. The OS fuel gauge IC is still reading a state-of-charge estimate from earlier in the discharge curve, so it shows 20–30% while the actual cell voltage has already collapsed below the BMS cutoff threshold. The fix is a full calibration cycle: discharge to hibernate-cutoff with the screen at full brightness and a CPU load running, then charge to 100% uninterrupted. The fuel gauge IC resets its empty-voltage reference point and the premature shutdown stops. Confirm the pack voltage reads above 10.5V at full charge using a multimeter on the connector before reinstalling.

Compatible Models

PC-AB6100A

Replaces Part Numbers

BTP-33A1

Technical Specifications

Voltage9.6V
Amp Hours4000mAh
Capacity4000mAh
Rate38.4Wh
Gross Weight150g /5.29 oz
Approximate Weight150g /5.29 oz
Dimension 132.00 x 89.80 x 22.00mm

Product Highlights

  • Brand: Hitachi
  • Manufacturer: CS
  • Series: Standard
  • Color: Dark grey
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The PC-AB6100A fuel gauge is jumping all over the place — showing 60%, then 80%, then 45% within a few minutes. Is the new battery faulty?

The fuel gauge IC on the PC-AB6100A loses its calibration reference when the old cell is swapped out because it was tracking charge curves from the previous cell's chemistry signature. We see this on the bench after every cell replacement — the gauge reads erratically for the first two to three cycles. Run two complete discharge-to-hibernate then uninterrupted full-charge cycles and the IC re-learns the new cell's voltage curve. After the second cycle the gauge stabilises to within a few percent.

System info on the PC-AB6100A is showing a different Wh rating than the 38.4Wh on the label — why does it not match?

The Wh figure Windows reads comes from the EEPROM data embedded in the battery's communication chip, which stores the rated design capacity coded at the factory. The 38.4Wh on the product label is the actual measured capacity of the cells under standard test conditions, and these two numbers can differ by a small margin depending on how the OEM encoded the design spec versus real-world cell output. This is not a capacity loss — it is a reporting difference between EEPROM design data and bench-measured cell output. After one full calibration cycle the OS reported value will shift closer to the actual cell capacity as the fuel gauge IC overrides the static EEPROM baseline.

The PC-AB6100A stopped charging at 80% and will not go higher — is the battery stuck?

On the PC-AB6100A this is almost always a BIOS-controlled charge limit, not a cell fault. Some Hitachi notebook firmware activates a charge ceiling to reduce cell stress when it detects a battery flagged as aged in its learn table — and a freshly installed cell can still trigger that flag before the learn cycle runs. Go into the BIOS power settings and check for a battery charge threshold or care-charge option and set it to 100%. If no such setting exists, run a full discharge-to-hibernate cycle, then charge uninterrupted — the BIOS learn cycle resets the threshold and charging proceeds past 80%.

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