Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: What Dell did you get this for?  I'm looking for one to fit my Latitude E6420.  Thanks for any help!
Document: I ordered a &#34;E6420&#34; battery for my Dell E6420. The battery I received indicated it is for the &#34;E6420&#34; Dell model, but was larger than the battery port would allow (i.e., wrong size).
This battery is replacing my original battery which was exactly the same. My original battery would power my laptop 5 to 6 hours when it was new. I am lucky to get 2 to 3 hours use out of this battery. Don't know what changed but the new one is not as good.
They are asking I return the battery &#34;... then we deal with the refund for you....&#34; (Before returning the wrong battery, shouldn't the company provide me the correct battery first)?2. Why does the company suggest I &#34;...chose the wrong cell battery...&#34; for my laptop, when the 'E6420' battery I ordered was supposed to fit the 'E6420' computer?
Out of the box, this replacement battery was no better than my weakened original, but I decided to stick it out. After a week or two of full charges and deep discharges--down to the &#34;Low Battery&#34; warning--it started performing better. Now, with normal writing and WiFi surfing, I get anywhere from 7-9 hours on a full charge.
Replacement laptop batteries can be an iffy proposition. Genuine OEM parts are expensive and, even with the real thing, can be a disappointment. Going for the cheapest option can deliver a piece of junk that won't hold a charge and starts a fire in an overhead compartment. This battery struck me as a good compromise. It is not real Dell, but something very close.
I bought this battery because the old battery on my Dell laptop had gotten to where it would only last 45 minutes or so and be down to 10%. This extended life battery while it sticks out about an inch farther in the back of the laptop is MUCH better. When fully charged and with the screen on full brightness it gives 6 solid hours of performance. Turning down the screen and adjusting the settings for battery life it goes even longer. Highly recommended.
Almost 5 hours with a full charge and even though my e5520 does not support the split battery, this battery gives me almost 9 hours with the split battery!The trick with the split is that you must attach it fully charged with a fully charged battery.
Answer: I got it for the Latitude E6520