Something to keep in mind about buying "new" batteries off places like ebay and third party suppliers - Although the battery is new as in its never been installed and used in a laptop, Lithium Ion batteries start aging the second they come off the assembly line. Regardless of how many cycles you put on one, performance starts to degrade the day it was made, and the battery will be in serious decline by the age of 3 or so. Other factors, such as the temperature and level of charge it was stored at also come into play in determining the overall health of the battery out of the box.
So those cheaper batteries you find for sale on ebay, if they were bought as surplus and have sat around for a couple years, may not be the bargain you are expecting, even if they do say Dell on the outside.
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-Scott
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