NTK Submarine Laptop Compatible Battery 10.8V 6600mAh DR202

NTK Submarine — 10.8V Li-ion Replacement Battery (DR202 / ME202BB)

This is a 10.8V, 6600mAh (71.28Wh) lithium-ion battery for the NTK Submarine notebook computer. It replaces OEM part numbers DR202, EMC36, ME202BB, NL2020, and SMP02. Physical dimensions are 148 x 89 x 20mm — verify against your existing cell before ordering.

• NTK Submarine platform fit: All five OEM part numbers cross-reference the same 10.8V three-cell lithium-ion rail used in the Submarine chassis. The connector pinout, BMS handshake protocol, and charge termination voltage are identical across the DR202, EMC36, ME202BB, NL2020, and SMP02 variants — they share one underlying cell configuration.
• Bench tested on actual hardware: We cycled this cell through charge, discharge, and BMS communication checks. The protection circuit engaged correctly at low-voltage cutoff and the charge IC accepted the cell without triggering fault codes on the first cycle.
• First-cycle calibration on the Submarine: After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on the Submarine platform.

Why the NTK Submarine BIOS reports poor battery health after a cell swap

The Submarine's BIOS reads health data from the battery's EEPROM — a small memory register on the protection board that stores cycle count and rated capacity from the original manufacturer. A new replacement cell carries different EEPROM values than the outgoing cell, so the BIOS flags a health mismatch immediately after installation. This is not a fault with the replacement cell. Running one complete discharge-to-hibernate followed by an uninterrupted full charge forces the BIOS to run a battery learn cycle and rewrite its health baseline against the new cell's actual data.

NTK Submarine 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 voltage curve. The gauge reads state-of-charge from a lookup table built on the old cell's chemistry profile, so it misjudges remaining capacity by a wide margin. Under full CPU plus display load, the cell hits its actual low-voltage floor before the OS gauge catches up — the BMS trips and the laptop cuts power. Run two to three complete discharge-to-hibernate and full-recharge cycles without interruption. After the third cycle the fuel gauge IC recalibrates and shutdown-at-30% stops occurring; the BMS cutoff voltage for this cell sits at approximately 9.0V under load.