About this replacement
Barnes & Noble GlowLight 3 — 3.7V Li-Polymer Replacement Battery (PR-305084-ST)
This 3.7V 1500mAh lithium-polymer cell replaces the original PR-305084-ST battery in the Barnes & Noble GlowLight 3, GlowLight 6-inch, and BNRV520 e-readers. It fits the slim 84.15 x 49.50 x 2.70mm cavity directly and connects to the existing board connector. Capacity matches OEM spec at 5.55Wh.
- GlowLight 3, GlowLight 6-inch, and BNRV520 fitment: These three models share the same battery bay dimensions, connector pinout, and power management circuit. The BMS on each draws from the same voltage rail, so one cell works across all three without any hardware modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the GlowLight platform and confirmed the BMS accepted the cell without fault flags. The protection circuit tripped correctly at low-voltage cutoff and resumed normal operation after recharge.
- Post-swap charge cycle on GlowLight firmware: After installing this cell, charge through USB before powering on. GlowLight firmware recalibrates the battery percentage gauge on the first full charge cycle — skipping this step causes the indicator to read inaccurately for several days.
Why the GlowLight 3 shows an inaccurate battery percentage after a cell swap
The GlowLight firmware tracks charge state using a coulomb counter calibrated to the original cell's charge curve. When a new cell goes in, that counter starts from stale reference data. The display can show 80% on a cell that is actually near empty, or drop suddenly from 50% to 5%. Running one complete charge cycle from flat to full resets the reference point. After that cycle, percentage readings stabilise.
Page turn response sluggish immediately after battery replacement
E-ink displays require a voltage spike to refresh each page. If the new cell shipped at storage voltage — typically around 3.6V — the board may throttle the refresh driver to protect the cell. This makes page turns feel slow or slightly delayed. It is not a hardware fault. Charge the device to full before use and the refresh speed returns to normal once voltage climbs above 3.8V.