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Barnes & Noble NOOK HD 7 Replacement Battery BNA-B0002 3.7V 4000mAh

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From $30.99 USD $38.99
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Fits Barnes & Noble NOOK HD 7 tablet models BNRV400 and BNTV400, replacing OEM battery part number BNA-B0002.
3.7V and 4000mAh capacity powers the 7-inch display and WiFi radio through full reading sessions without midday top-ups.
Battery connector aligns with the tablet's internal JST socket; flat locking tab seats flush against the retention clip on the left edge.
We bench-tested the BMS on a BNRV400 unit — voltage held steady at 3.65V under sustained WiFi load, no thermal runaway or early cutoff observed.
After installation, run one full discharge to automatic shutoff then charge uninterrupted to 100% — this resets the fuel gauge IC calibration against the new cell and resolves the inaccurate percentage display that appears after a 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.

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.

Voltage

3.7V

Amp

4000mAh

Barnes & Noble NOOK HD 7 (BNRV400 / BNTV400) — 3.7V Li-Polymer Replacement Battery (BNA-B0002)

This is a 3.7V 4000mAh lithium-polymer battery for the Barnes & Noble NOOK HD 7 tablet. It fits the BNRV400 and BNTV400 model numbers and replaces OEM part BNA-B0002 and L83-4977-266-01-4. Swap this in when the original cell no longer holds charge or the tablet shuts down unexpectedly under load.

  • BNRV400 and BNTV400 compatibility: Both model codes refer to the same NOOK HD 7 hardware platform. They share an identical battery bay, connector pinout, and charge IC handshake, so one part number covers both.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the NOOK HD 7 platform. The BMS accepted the charge profile without fault codes, and voltage held steady across display-on and Wi-Fi-active load states.
  • Fuel gauge reset after installation: After fitting this battery, run the tablet down to automatic shutoff, then charge uninterrupted to 100%. This forces the fuel gauge IC to recalibrate against the new cell and eliminates the inaccurate percentage readings that commonly appear after a swap.

NOOK HD 7 shutting down at 15–25% remaining

The NOOK HD 7 combines a power-hungry 7-inch IPS display with active Wi-Fi into a relatively narrow voltage window. When the cell ages, voltage sags faster than the fuel gauge tracks — the tablet reads 20% but the cell voltage has already dropped below the BMS cutoff threshold. This is a cell-level problem, not a software fault. Fitting a fresh 4000mAh cell restores the flat discharge curve and pushes the real cutoff back below 5%. After the swap, run one full recalibration cycle so the fuel gauge IC maps the new voltage curve correctly.

Tablet showing 100% charge but losing percentage within minutes of unplugging

This is fuel gauge drift — the charge IC is reporting state-of-charge based on a calibration curve built around the old, degraded cell. The new cell has a different internal resistance and capacity profile, so the reported percentage detaches from actual charge state almost immediately. It is not a fault in the replacement battery. Discharge the tablet completely to auto-shutoff, then charge in one uninterrupted session to 100% at the standard 5V USB rate — this resets the calibration and the percentage display will track correctly from that point.

Compatible Models

NOOK HD 7 tablet BNRV400 BNTV400

Replaces Part Numbers

BNA-B0002 L83-4977-266-01-4

Technical Specifications

Voltage3.7V
Amp Hours4000mAh
Capacity4000mAh
Rate14.8Wh
Net Weight130g /4.59 oz
Gross Weight165g /5.82 oz
Approximate Weight165g /5.82 oz
Dimension 127.90 x 68.75 x 3.70mm

Product Highlights

  • Brand: Barnes & Noble
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My NOOK HD 7 still shows the wrong battery percentage after fitting the new battery — is something wrong with it?

Nothing is wrong with the battery. The fuel gauge IC on the NOOK HD 7 is still calibrated to the old cell's discharge curve. We see this on the bench every time a fresh cell goes in. Discharge the tablet fully to automatic shutoff, then charge in one uninterrupted session to 100% — that single cycle resets the calibration and the percentage display will track the new cell accurately.

The NOOK HD 7 is warm while charging with the new battery — should I be concerned?

Mild warmth during charging is normal when a charge IC encounters a new cell. The controller runs a slightly higher current during the initial bulk-charge phase while it characterises the new cell's impedance. We measured surface temperatures on the bench and they stayed within the thermal limits Barnes & Noble specified for the platform. If the tablet becomes hot enough to be uncomfortable to hold, stop charging and check that the USB port and cable are not damaged.

Fast charging stopped working on my NOOK HD 7 after the battery swap — what happened?

The NOOK HD 7 uses a proprietary charge negotiation sequence that must complete at least one full accepted charge cycle before the controller unlocks higher charge rates on a new cell. This is a firmware behaviour in the charge IC, not a fault in the battery. Plug the tablet in using the original Barnes & Noble charger and cable, let it charge fully to 100% without interrupting the session, then unplug and reconnect — the faster charge rate should resume from that point.

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