This Dell 9NJM1 Battery has a capacity of 68Wh and a voltage of 15.2V. Suitable for Dell Alienware 17 R4 ALW17C-D1748 ALW17C-D1758. 100% compatible and 100% safe. 1-year warranty, 30-day money back guarantee. 

Dell 9NJM1 68Wh 15.2V Notebook Battery

(product code: 9NJM1) （Usually ships the same business day!）

• Product details：
• Brand: Dell 9NJM1 Notebook batteries
• Type: Li-ion battery
• Voltage: 15.2V
• Capacity: 68Wh
• SKU: DEL3022

Replace the following batteries:

0546FF 0HF250 44T2R 9NJM1 HF250 MG2YH

Compatible with the following models:

DELL Alienware 15 R3
DELL Alienware 17 R4
DELL ALW17C-D1738
DELL ALW17C-D1748
DELL ALW17C-D1758
DELL ALW17C-D1848
DELL ALW17C-D2738
DELL ALW17C-D2748
DELL ALW17C-D2758
DELL ALW17C-R1748

• If you cannot find what you need, we have some sister stores. Here we go!
• ES: Dell 9NJM1 Batería 
• 
  
• NL: Dell 9NJM1 ACCU 
• 
  
• IT: Dell 9NJM1 batteria 
• 
  
• DE: 9NJM1 Akku 

http://www.notebookbattery.co.nz/laptop-batteies-dell/replace-battery-9njm1-b179319.htm

Extend Notebook Battery Dell 9NJM1 Service life 

1.Charge the battery! Consider keeping it plugged in for 12 hours before you unplug.

2. Switch on the optimized battery or power feature. You'll find this option — sometimes referred to as max battery mode — in your Notebook Battery system's built-in power management control panel. You can select the option to reduce the amount of time your inactive Notebook Battery stays on before powering itself down and going to sleep.

3. Remove the battery and clean the metal contacts. Wipe them with alcohol, ideally every two months, to ensure that the power transfer between the Notebook Battery and its battery is as efficient as possible. Allow the battery to dry thoroughly before replacing it! 

4. Unplug any Notebook Battery accessories you aren't using. Even if they're not in use, accessories drain power from the battery.

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