Btw, what you linked seems removed from dell site. Only place I see I can get new battery is partsPeople.

If what you're looking for is more battery runtime, going from 62WHr to 52 is heading in the wrong direction.  It sounds like your present battery has a dead cell in it.   The battery for your system is this one:

accessories.us.dell.com/.../PfydFeaturedCategoryResults.aspx

I don't think cell is dead, I have read about this problem from other e5470 owners. And my battery shows in Linux to have 83 percent state (not charge, I am talking about wear and tear level), when it was 99 the problem was also there. Taking the same battery as I have and expecting different results seems dumb to me. I am not really wanting more battery life, just reliability on battery, as in no shutdowns or quirks before battery is really empty. And 52Whr battery seems to give more voltage and has 4 cells in 4 compartments when looked from behind, while this one I have looks like it has 2 cells per compartment

Hi gnufreex,

You can check the battery health in the BIOS/setup (tap the F2 key at start-up) - expand "General" then select "Battery Information"

There are also battery tests in the diagnostics (power the system on whilst holding down the Fn key to initiate)

If the battery is needing replaced it will tell you there. If it does, please PM me your service tag and contact details, I'll look into your options.

I did battery test in diagnostics, it passed. Says battery is good.

There is one more issue. When battery is outputting less than 7.5V like on pic, whenever I close the lid and open it computer restarts. It can't wake from suspend when battery is weak. Also, shutdowns only seem to happen if I did suspend before. Now I rebooted computer and battery is running fine under stress test, probably will go till 0%. 

I learned that there is a battery for this laptop that is 2XNYN part number, 66Whr and 11V. I think I want this battery regardless if the problem I am having is connected to battery. This battery I have will wear and tear, already at 80% so 2XNYN is next battery I will get. Problem is I can't find it from dell.

Regarding this problem with the shutdown, I have updated bios like Alsdair told me, I have not got a shutdown since. Lets hope it is fixed. Also I found another suspect for shutdowns, this dmesg warrning

ahci 0000:00:17.0: port does not support device sleep

This is SATA port where my SanDisk is connected. I can't update sandisk firmware in Linux, i might take it to some other computer to update. But I think it is not due to firmware. I will probably get Samsung NVMe drive soon, and this SanDisk will move to desktop workstation.  

Bummer. I now get shutdowns even when battery is at 70%. The laptop is totally useless when not plugged in. And battery went down in wear, now it is 78% and it was 82%

I chatted with Dell support about 66Whr battery, they say they don't have it and not sure when they will get it if ever.

I was thinking what changed after I thought that problem is fixed unti it got worse. It was that I left laptop with lid closed but inpluged and in suspend mode entire night. In morning it had some battery left, clock was showing wrong time, and it actually shutdown before battery was fully discharged. Then it took like 12 hours to recharge.

I think CMOS battery might be the culprit of wrong time problem... and also shutdowns might be due to CMOS battery...

I got this after one of shutdowns on battery. I power it up and plug AC, works without hitch. Really puzzled. 

Also noticed some coil whine when battery is charging and discharging.