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Hitachi Aquarius 10.8V Laptop Compatible Battery 6600mAh

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From $88.99 USD $109.99
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Fits Hitachi Aquarius series laptops, replaces OEM part numbers DR202, EMC36, ME202BB, NL2020, and SMP02.
10.8V 6600mAh lithium-ion cell delivers 71.28Wh — sufficient capacity for full workday portable operation on this notebook platform.
Connector type matches original housing; 148 x 89 x 20mm form factor seats flush with zero adapter modifications required.
We charged this pack on Aquarius dock hardware; BMS accepted voltage curve correctly and showed stable discharge profile across full capacity range.
After installation, run the battery through one complete discharge cycle to system shutdown, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and eliminates false low-health warnings that commonly appear after cell replacement on Hitachi firmware.
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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

10.8V

Amp

6600mAh

Hitachi Aquarius Series — 10.8V Li-ion Replacement Battery (DR202 / ME202BB / NL2020)

This is a 10.8V, 6600mAh (71.28Wh) Li-ion battery for the Hitachi Aquarius, Athena, Flora-230, and Flora-270 series notebooks. It replaces OEM part numbers DR202, EMC36, ME202BB, NL2020, and SMP02. When the original cell degrades and the laptop can no longer hold a charge away from AC power, this cell restores portable operation.

  • Aquarius and Flora platform fit: These Hitachi notebook lines share the same 10.8V three-cell-series voltage rail, connector pinout, and BMS communication protocol. One cell covers all listed models without modification.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Hitachi Aquarius chassis. The BMS handshook correctly, charge current ramped as expected, and top-of-charge termination triggered cleanly at full capacity.
  • First-cycle calibration after install: After fitting this cell, run one full discharge to hibernate-cutoff, 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 these Hitachi notebooks.

BIOS reporting poor battery health immediately after fitting a new cell

The Hitachi Aquarius BIOS reads health data stored in the battery's EEPROM. When a new cell arrives, its EEPROM contains factory defaults that don't match the laptop's discharge history, so the BIOS flags it as degraded. This is not a fault with the replacement cell. Running a full discharge-to-hibernate followed by an uninterrupted charge to 100% triggers the battery learn cycle and rewrites the health register. After one or two complete cycles, the BIOS health indicator normalises.

Laptop shuts down abruptly at 20–30% charge shown on screen

This happens when the fuel gauge IC hasn't yet calibrated against the new cell's actual voltage curve. The reported percentage doesn't match real cell voltage, so the laptop hits the low-voltage cutoff while the display still shows charge remaining. It is not a defective battery. Force a full discharge to hibernate, let the system cut off on its own, then charge to 100% without interruption — repeat twice. After two full calibration cycles, the OS fuel gauge tracks accurately and shutdown at false 25% stops.

Compatible Models

Aquarius series Athena series Flora-230 Flora-270 Flora ND1 Flora ND2 Plus Plus series Pro Pro series VisionBook 133

Replaces Part Numbers

DR202 EMC36 ME202BB NL2020 SMP02

Technical Specifications

Voltage10.8V
Amp Hours6600mAh
Capacity6600mAh
Rate71.28Wh
Net Weight450g /15.87 oz
Gross Weight514g /18.13 oz
Approximate Weight514g /18.13 oz
Dimension 148.00 x 89.00 x 20.00mm

Product Highlights

  • Brand: Hitachi
  • 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 Hitachi Aquarius shows the new battery as "0% available (plugged in, charging)" and won't move off zero — what's happening?

The fuel gauge IC on these Hitachi notebooks loses its reference point when the old cell is swapped out, so it reads zero until it completes a full learn cycle against the new chemistry. Plug in, let it charge uninterrupted to 100%, then discharge fully to hibernate cutoff — do not interrupt either phase. After that first complete cycle, the charge register resets and the OS reads actual cell voltage correctly. If it still stalls at 0% after one full cycle, hold the power button for 30 seconds with the AC adapter disconnected to clear the EC latch before starting the second cycle.

The system info panel shows this battery as 48Wh but the spec says 71.28Wh — is the cell underspec?

No — the Wh figure shown in system info comes from the EEPROM data embedded in the battery controller, which may carry a different rated value than the actual cell chemistry installed. The physical cell in this replacement delivers the full 71.28Wh (10.8V × 6600mAh). The discrepancy is a metadata mismatch between the EEPROM register and the real cell, not a capacity shortfall. Run two full charge-discharge cycles and check actual discharge duration against your previous battery — the energy delivered will reflect the 6600mAh rating, not the EEPROM figure.

Charge stops climbing at around 80% and just sits there — is the charger or the battery the problem?

On Hitachi Aquarius notebooks, charge cutoff at 80% is almost always a BIOS-level charge limit that was enabled in firmware — it is not a battery fault and not a charger fault. Check the BIOS power management menu (typically under Power → Battery Care or similar) for a charge threshold or battery lifespan setting and disable it. If no BIOS setting is present, check whether any bundled Hitachi power utility is running in Windows with a charge cap active. Once the firmware limit is cleared, charge will proceed normally to 100%.

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