D442 D642 Battery, CAD$58.08 Batteries For EMACHINE D442 D642 Laptop Computer

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D442 D642 Battery, CAD$58.08 Batteries For EMACHINE D442 D642 Laptop Computer, 4400mAh, 10.8V, Black , Li-ion

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Genuine EMACHINE D442 D642 Battery For laptop 4400mAh, 10.8V, Black , Li-ion

Battery ID:	NACAS57414400B6
Battery Description:	Battery For D442 D642
Battery Type:	Rechargerable Li-ion Battery
Battery Volt:	10.8V
Battery Capacity:	4400mAh
Battery Color:	Black
Battery Weight:	311g
Battery Cells:	Grade A, 6 Cells
Condition:	Original / Genuine Battery - 1 Year Warranty
Buy Note:	For correct laptop battery, Pls carefully check original battery's shape, model, volt, interface location, fixed screw hole location, number of wires...

Quantity	2-4	5-9	10-19	20-49	50+
Discount	5%	8%	10%	12%	15%

• In Stock
• Original price: CAD$ 73.52
• Today's Price:
  
  CAD$ 58.08
  ( Updated: Nov 2024 In stock)
• You Save: CAD$ 15.44

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Genuine EMACHINE D442 D642 Battery For laptop 4400mAh, 10.8V, Black , Li-ion
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D442 D642 Battery, CAD$58.08 Batteries For EMACHINE D442 D642 Laptop Computer, 5200mAh, 10.8V, Black , Li-ion

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EMACHINE D442 D642 Replacement Battery 5200mAh 10.8V Black Li-ion

Battery ID:	NACAS57415200B6O
Battery Description:	Battery For D442 D642
Battery Type:	Rechargerable Li-ion Battery
Battery Volt:	10.8V
Battery Capacity:	5200mAh
Battery Color:	Black
Battery Weight:	290g
Battery Size:	271 x 53 20mm
Battery Cells:	Grade A, 6 Cells
Condition:	Brand New, Replacement Battery, 1 Year Warranty
Buy Note:	For correct laptop battery, Pls carefully check original battery's shape, model, volt, interface location, fixed screw hole location, number of wires...

Quantity	2-4	5-9	10-19	20-49	50+
Discount	5%	8%	10%	12%	15%

• In Stock
• Original price: CAD$ 55.46
• Today's Price:
  
  CAD$ 43.81
  ( Updated: Nov 2024 In stock)
• You Save: CAD$ 11.65

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EMACHINE D442 D642 Replacement Battery 5200mAh 10.8V Black Li-ion
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D442 D642 Battery, CAD$58.08 Batteries For EMACHINE D442 D642 Laptop Computer, 7800mAh, 10.8V, Black , Li-ion

1 Year warranty Fast Shipping 30 Days Money Back  Ask a Question         Share This Item
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EMACHINE D442 D642 Replacement Battery 7800mAh 10.8V Black Li-ion

Battery ID:	NACAS57417800B9O
Battery Description:	Battery For D442 D642
Battery Type:	Rechargerable Li-ion Battery
Battery Volt:	10.8V
Battery Capacity:	7800mAh
Battery Color:	Black
Battery Weight:	443g
Battery Cells:	Grade A, 9 Cells
Condition:	Brand New, Replacement Battery, 1 Year Warranty
Buy Note:	For correct laptop battery, Pls carefully check original battery's shape, model, volt, interface location, fixed screw hole location, number of wires...

Quantity	2-4	5-9	10-19	20-49	50+
Discount	5%	8%	10%	12%	15%

• In Stock
• Original price: CAD$ 65.30
• Today's Price:
  
  CAD$ 51.58
  ( Updated: Nov 2024 In stock)
• You Save: CAD$ 13.72

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EMACHINE D442 D642 Replacement Battery 7800mAh 10.8V Black Li-ion
( 3-11 days free Shipping In Canada. )

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Question about D442 D642 laptop battery ( From internet ):

Why do D442 D642 laptop batteries degrade so fast?

The more you use your D442 D642battery the quicker it loses its "charge."  Batteries have a limited number of "cycles" (or charges and discharges).  This number used to be in the low 100s about five years ago, but is now reaching the point of almost 1000.

Honestly, if you use your battery regularly, I would expect it to lat as long as yours has.  It's sort of just the expense involved with using a laptop regularly.  Think of it like your car: Parts wear out.

It's a problem that scientists have struggled to solve because they couldn't figure out what was causing such sudden and rapid battery deterioration.

But now researchers at the US Department of Energy have identified why rechargeable batteries lose their ability to hold a charge over time.

Working with lithium-ion batteries, which are the most commonly used type of battery in consumer devices, the researchers were able to map their charge and discharge process down to a few billionths of a metre to find exactly how degradation occurs.

Their research appears in a pair of studies published by Nature Communications, and according to Matt Safford at Smithsonian Magazine, two main culprits in battery degradation were identified:

"The first: microscopic vulnerabilities in the structure of the battery material steer the lithium ions haphazardly through the cell, eroding the battery in seemingly random ways, much like rust spreads across imperfections in steel.

In the second study, focused on finding the best balance between voltage, storage capacity and maximum charge cycles, researchers not only found similar issues with the ion flow, but also tiny accumulations of nano-scale crystals left behind by chemical reactions, which cause the flow of ions to become even more irregular after each charge."

Running batteries at higher voltages also led to more ion path irregularities, and thus a more rapidly deteriorating battery."

We should expect to replace D442 D642 laptop battery every 1-2 years. If it lasts longer, that's great, but I would anticipate replacing it around then.

How do I check whether D442 D642 laptop battery is dead or not?

1. Press F8 when booting up your D442 D642 laptop.
2. At the bottom after the booting options, there will be a system diagnostics.
3. After selecting that, your system will automatically check the proper working of every part (hardware) of your laptop.
4. That should do it. To be safe, try disconnecting and then connecting the battery again before the diagnostics.