About this replacement
Acer N20 / N20w — 3.7V Li-Polymer Replacement Battery (865Y032)
This 3.7V, 1300mAh Li-Polymer battery replaces the original cell in the Acer N20 and N20w Pocket PC. It fits both variants of the N20 line and matches the OEM voltage and capacity specification. The part numbers 865Y032 and BT-12416 cross-reference to this cell.
- N20 and N20w fit: Both models share the same battery bay dimensions, voltage rail, and connector pinout, so one cell covers both variants without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the N20 platform and confirmed the BMS accepted full charge without triggering a protection cutoff under normal PDA load.
- Pre-swap sync: The N20 stores open application state and unsaved data in RAM powered directly by the main battery. Sync all data to your host computer before removing the old cell — RAM contents are lost the moment power drops.
Why the N20 fails to boot after a battery swap
The N20 boot sequence checks for a minimum voltage threshold before the processor initialises. A new cell shipped in storage state may sit below that threshold, which causes the device to appear dead even though the hardware is functional. Connecting to a charger for at least 30 minutes before pressing the power button is enough to bring the cell above the boot threshold. Do not interpret a blank screen immediately after swap as a faulty battery.
Wireless sync dropping or slowing after a battery replacement
The N20's wireless radio is voltage-sensitive and draws a short current spike when transmitting. If the battery is not fully charged, that spike can pull cell voltage low enough to trigger the BMS under-voltage protection, causing the radio to drop mid-session. Charge the battery to full — approximately 4.2V at the cell — before attempting ActiveSync or Bluetooth pairing. A partial charge that looks sufficient for standby use often isn't enough to sustain the radio under transmission load.