did you mean to ask what to do if your laptop battery is not charging? if that is the case http://laptop-battery-not-charging.com/ might be able to help you.
rebuild? do you mean make a laptop battery yourself, it certainly can't
"The specifications of a Dell e1505 battery is that it is an Internal Notebook Battery. The technology is 9-cell Lithium ion, the Voltage Provided is 11.1V and the Capacity is 85Wh."
For a laptop battery there are no 90W or 65W but there are 90WH and 65WH. If you mean this so you can replace a 90WH battery with a 65WH battery but the 65WH one can't last longer than the 90WH one at the same load.
Battery is Down.
It means the battery is full.
It depends on the voltage. WH = Watt Henry, mAH = milliamp Henry, watts = amps * volts and milliamps= 1000 * amps. Thus the conversion is: mAH = 1000 * WH / V, where V is the voltage. I'm looking at the battery for my Dell Studio and it's rated 85WH and 11.1V. So it's 1000 * 85 / 11.1 = 7658 mAH, so in this case 85WH is better than 6600 maH. If we solve 1000 * 85 / V = 6600, we get V = 12.9. When converting from WH, the bigger the voltage the lower the mAH. So for voltages bigger than 12.9 V, 6600mAH is better than 85WH. Hope this helps.
The battery is a component of the laptop but is not a part of the Laptop itself.
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no,on Portable laptop power supplies typically have larger battery capacity than laptop battery , so the battery more durable
Laptop Battery
if the laptop battery over charged, the laptop battery will get hot, Seriously will damage the battery, but now most of the laptop battery have a overshoot protection, when the battery was full charged, it will stop charging automatic, so it won't worry about it