Asus VivoBook E12 E203NA Compatible Battery 7.7V 4900mAh Warranty:Warranty 3 Year The protection circuit held voltage

The protection circuit held voltage within spec across the full discharge curve without triggering false low-battery interruptions

voltage sags enough to trigger the protection threshold even though real capacity remains

The connector pinout and physical dimensions are matched to the chassis tray — no modification needed

The FastFind self-test draws a brief activation current to verify transmit readiness

0V under load

Asus VivoBook E12 E203NA Compatible Battery 7.7V 4900mAh Warranty:Warranty 3 Year The protection circuit held voltageAsus VivoBook E12 E203NA Series 7. 7V Li Polymer Replacement Battery (C21N1807) This is a 7. 7V, 4900mAh (37. 73Wh) Li Polymer replacement battery for the Asus VivoBook E12 E203NA FD020TS and a range of related E203 and C223NA models. It slots into the same bay as the original C21N1807 cell and connects via the same 2 cell BMS board. Voltage and connector match the OEM spec exactly. E203 and C223NA platform fit: These models share a 2 cell 7. 7V Li