Welcome to VANPIR:
We are a professional laptop battery manufacturer, dedicated to manufacture and provide high-quality different types of laptop batteries for our customers.

Specification:
Model:C21N1818-1 Battery Type: Li-ion
Voltage: 7.7V Capacity: 37Wh/4850mAh
Location of connector and Cable length: Please refer to the battery picture and compare it with your original battery

Replacement Part Number:
AA-PBTN4LR BA43-00386A AA-PBTN4LR-05

Compatible Models: (use "Ctrl+F to find your model quickly")
Fit for for Samsung Notebook 9 Pro NP940X3M （NP940X3M-K01US, NP940X3M-K02US, NP940X3M-K03US）Series

Note: For more accurate, pleas e check the part number of your original battery

Packing Included:
1* C21N1818-1 battery
1* Instruction manual

Warm tips before purchase:
Please open your laptop case, check and confirm your original battery model and appearance, compared with our battery image, make sure that's what you need. Especially the location of the connector and the cable length (long or short)

Battery Maintenance Method for Optimal Use:
① When you get the new battery, discharge the battery to 5% (not 0%), then charge and cycle 3-4 times to wake up the new battery ② The important point is to perform a full discharge and charge every other month to extend the battery life ③ Do not connect the adapter for a long time while using the battery. It may damage the battery ④ Avoid artificial shocks, disassembly, crush, or puncture. Do not dispose of it in fire or water