About this replacement
Samsung NP-N310 Series — 7.4V Li-ion Replacement Battery (AA-PB0TC4B)
This 7.4V Li-ion cell replaces the original battery in the Samsung NP-N310 netbook and its regional variants, including the KA03, KA04, and KA05. It carries 6600mAh (48.84Wh) of capacity and fits the full NP-N310 lineup that shares the AA-PB0TC4B connector and BMS handshake. Install it into any NP-N310 unit and the system recognises it through the standard Samsung battery communication protocol.
- NP-N310 variant coverage: The N310 range spans multiple regional SKUs — KA03 through KA05 and beyond — but every unit runs the same 7.4V two-cell rail with the same 10-pin connector and BMS communication line. One cell fits the entire family because the hardware spec never changed across regional releases.
- Bench tested on actual hardware: We ran this cell on an NP-N310 unit and confirmed the BIOS battery handshake completed without error codes. The BMS held charge accurately across three full cycles, and the system fuel gauge tracked state-of-charge without drift during discharge.
- Post-install calibration on the N310: After fitting this cell, run the laptop down until it hibernates at low battery, then charge uninterrupted to 100% before unplugging. This forces the N310's fuel gauge IC to resync against the new cell's actual capacity and clears the false "battery health poor" flag that appears in the BIOS after any cell swap.
Why the NP-N310 BIOS flags poor battery health after a cell swap
The N310 stores battery health data in the EEPROM of the original cell, not in the laptop itself. When a new cell goes in, the BIOS reads no prior cycle history and interprets that as a degraded or unknown battery. The health warning is a data-gap problem, not a fault with the replacement cell. Running one full discharge-to-hibernate followed by a full uninterrupted charge writes fresh data to the fuel gauge IC and clears the flag.
NP-N310 shutting down 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 gauge predicts remaining capacity based on the old cell's profile, so it misjudges the voltage cliff and triggers a shutdown well before the actual cutoff point. It is not a fault in the replacement cell — it corrects itself after two to three full discharge and recharge cycles. If shutdown continues past three cycles, check that the BIOS battery learn cycle completed fully by confirming the unit reached 100% without interruption.