About this replacement
Barnes & Noble Nook Simple Touch — 3.7V Li-Polymer Replacement Battery (DR-NK03)
This 3.7V, 2150mAh Li-Polymer cell replaces the original battery in the Barnes & Noble Nook Simple Touch e-reader. It fits the BNRV300 and Simple Touch 6" (BNTV350) variants. Swap it in when the original no longer holds a charge or the device fails to boot.
- BNRV300 and BNTV350 compatibility: Both the BNRV300 and BNTV350 variants use the same 3.7V cell footprint, connector pinout, and BMS handshake. The DR-NK03 part number covers all three variant names — Nook Simple Touch, Simple Touch 6", and BNTV350 — because they share identical battery bay dimensions (91.50 × 56.00 × 4.13mm) and protection circuit requirements.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Simple Touch platform. The BMS accepted the cell without flagging a protection fault, and the firmware began percentage reporting normally after a full charge cycle.
- Post-swap charge cycle on the Simple Touch: After installation, connect via USB and allow a complete charge before first use. The Nook Simple Touch firmware recalibrates its battery percentage display against a full-charge reference point — skipping this step causes the gauge to read inaccurately from the first session onward.
Why the Nook Simple Touch shows incorrect battery percentage after a cell swap
The Simple Touch firmware stores a charge reference from the previous cell. When a new cell is installed, that stored reference no longer matches the actual cell chemistry and capacity. The percentage display pulls from the old reference until the firmware resets it through a full charge-to-discharge cycle. Run at least one complete cycle — charge to 100%, use until the low-battery warning — and the gauge will re-anchor to the new cell's actual voltage curve.
Nook Simple Touch not powering on after battery replacement
A replacement Li-Polymer cell shipped in storage state typically sits at 3.0–3.2V, which is below the Nook Simple Touch's minimum boot voltage threshold. The device will not attempt to start if the cell voltage is too low. Connect the Nook to a USB charger immediately after installing the cell and leave it for at least 10 minutes before pressing the power button. If the screen remains blank after that window, confirm the battery connector is fully seated — the flat flex connector on this model can partially disengage during reassembly.