Barnes & Noble NOOK HD+9 Replacement Battery 3.7V 6000mAh

Barnes & Noble NOOK HD+ 9 — 3.7V Li-Polymer Replacement Battery (AVPB002-A110-01)

This is a 3.7V 6000mAh lithium-polymer battery for the Barnes & Noble NOOK HD+ 9-inch tablet (BNTV600). It replaces the original AVPB002-A110-01 / GB-S02-308594-0100 cell when the tablet no longer holds a charge or shuts down unexpectedly. It fits the BNTV600 chassis and its Ovation variant.

• BNTV600 and Ovation fit: Both models share the same 3.7V cell footprint, connector pinout, and BMS handshake protocol. The AVPB002-A110-01 part number covers both variants — one cell, two model names on the retail box.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a BNTV600 unit. The BMS accepted the cell without fault flags, voltage held steady across the display and Wi-Fi load curve, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration after install: After fitting this cell, run the tablet down to automatic shutoff — do not force it off manually. Then charge uninterrupted to 100%. This one full cycle lets the NOOK's fuel gauge IC map its readings against the new cell's actual capacity curve and clears the inaccurate percentage display that almost always appears after a swap.

NOOK HD+ shutting down at 15–25% remaining

The BNTV600 runs a 9-inch IPS display alongside Wi-Fi — both draw simultaneously during normal use. At around 3.6V cell voltage, combined load causes a brief voltage sag that the protection circuit reads as a low-voltage fault, triggering shutdown even though the percentage gauge still shows charge remaining. This is a BMS response to instantaneous load, not a defective cell. The fix is to complete the full recalibration cycle described above so the fuel gauge IC reports the correct voltage-to-percentage relationship under load.

Tablet showing inflated percentage after battery replacement

The NOOK HD+'s fuel gauge IC stores a learned model of the old cell's capacity curve in firmware. When a new cell goes in, that stored model no longer matches reality — the tablet may report 80% when the true state of charge is much lower, or it may drop from 40% to zero without warning. This is not a cell fault. Discharge the tablet fully to auto-shutoff, then charge it to 100% without interruption. That single cycle resets the IC's reference points against the new 6000mAh cell and restores accurate readings.