About this replacement
Medion Akoya E14303 / E15303 Series — 11.55V Li-Polymer Replacement Battery (456484-3S)
This is an 11.55V, 3850mAh (44.47Wh) Li-Polymer replacement battery for the Medion Akoya E14303 (NS14AR). It also fits the Akoya E14304, E15303, and E15309, along with seven additional Akoya variants sharing the same 456484-3S cell configuration. It restores unplugged operation to laptops where the original cell has degraded or failed to hold charge.
- Akoya NS14AR / NS15AR / NS15AL platform fit: These Akoya models share a common 3-cell Li-Polymer architecture, the same 456484-3S part number, and an identical flat-pack connector with matching BMS handshake signals. Swapping between variants in this group does not require firmware changes or connector adapters.
- Bench tested on actual hardware: We cycled this cell through charge, full discharge to BMS cutoff, and a second full charge on an NS14AR unit. The BMS accepted the new cell without a protection trip, and the charge controller progressed normally through all charge stages to 100%.
- Post-install calibration on NS14AR: After fitting, run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears in almost every Akoya battery swap.
BIOS reporting battery health as poor immediately after replacement
Medion Akoya laptops store battery health data in EEPROM on the battery controller. When a new cell goes in, the BIOS reads stale EEPROM values from the old cell's charge history and flags the replacement as degraded. This is a data mismatch, not a fault with the new battery. Running one full discharge-to-hibernate cycle followed by an uninterrupted full charge resets the learn cycle and writes fresh EEPROM baseline data. After that cycle, the health status should clear to normal.
Laptop shuts down abruptly at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's discharge curve. The percentage shown on screen does not match the actual cell voltage, so the laptop hits BMS cutoff before the OS sees 0%. It is most noticeable under combined CPU and display load, where voltage sag accelerates the drop. Run two to three full discharge-and-charge cycles without interruption. By the third cycle, the fuel gauge IC recalibrates and the displayed percentage aligns with the actual remaining capacity — shutdowns at false percentages stop.