The first Gotcha was that this battery is much more to a man out (RN 873), but it fits into the slot as well. Just keep going and down a bit.
Other Gotcha was absolutely no direction, there should be no problem, but ... Apparently Dell uses a Smart Power System, which has thousands of complaints on the Internet.
Anyway, I powered down, installed the battery and turned on. Power said 63%. OK so far. 12 hours later still 63 %.... Uh Oh.
Long story (about 7 hours of internet things, calling, trying to flash the BIOS, etc.) developed many horror stories about Lion batteries and Dell power supply. The dreaded "Unknown device" syndrome.
Here is what Dell recommends a restore. First, turn off and remove the battery. Second, unplug the AC adapter from the computer and the wall. Third Wait for the green light goes off. In my case I went and got coffee and watch a show.
Fourth - the adapter into the wall and the computer and turn on without battery installed.
After booting, insert the battery.
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