Unless you can remember changing the battery it's probably discharged -- just change it.  You can check the battery with a DMM if you have one, just to be certain.

As for memory errors, the last time I had memory errors it turned out to be a contact issue that I could resolve with a thorough cleaning using a piece of cotton swab soaked in magnetic head cleaner.    Contact cleaner would be the best, but most electronic cleaners should work just fine, and if you don't have any of those cleaning liquids, you can use denatured alcohol. 

I would most certainly try to clean the contacts before replacement.

I tried 70% isopropyl alcohol, it din't work. So then i tried an eraser still din't work. So I guess i'll be buying a replacement.

I have HYNIX HMT31GR7BFR4C-H9 PC3-10600R DDR3 1333 8GB ECC REG 2RX4.

Seller is giving similar one but with PCL3 and different model but same type and frequency.

All the other slots will have the PC3 one and A4 will have PCL3

Will it work in my server?

Also what type of CMOS battery should I buy? Or is there only one type?

Hi rizexor.

regarding the battery message, depending on your system your RAID Controller (if it is a SAS6/iR) might also have a battery, so if it is not specified any further it could be the CMOS battery or the PERC battery.

For both you will find the replacement instructions in the R410 Owner's Manual:
https://downloads.dell.com/manuals/all-products/esuprt_ser_stor_net/esuprt_poweredge/poweredge-r410_owner%27s%20manual_en-us.pdf

If it is the CMOS battery, simply replace it by another CR 2032 one.

If it is the RAID backup battery unit (BBU) it depends on the controller for a SAS6/i check out the web for a replacement with the following part number:  NU209

If it is a different one, let me know.

Regarding the memory, the PC3L one is a low voltage version of the other DIMM.
Mixing works but is not recommended.

You may end up with different limitations regarding speed as all the modules will be powered with the same voltage.

See this doc for reference:
https://downloads.dell.com/manuals/all-products/esuprt_ser_stor_net/esuprt_poweredge/poweredge-r410_user%27s%20guide6_en-us.pdf

Any further questions? Let me know.

BR
Stefan

Error in LED is E1210 motherboard battery failure Check battery. So is it CMOS?

Yup, that's it.

Thanks. Dumb question, but is this the correct one to buy?

https://www.amazon.in/Panasonic-Lithium-CR2032-5BE-Battery/dp/B00LVMTA2A/ref=sr_1_3?dchild=1&keywords=cr2032&qid=1615807477&s=electronics&sr=1-3&th=1 

Yes, this one is related to the CMOS battery.

Taken from the R410 manual:

E1210 Motherboard battery failure. Check battery.

CMOS battery is missing or the voltage is outside of the allowable range.

Replace the coin cell and you're good to go

Replaced the RAM (PC3 ram). And its working.

I replaced the CMOS also but everytime I boot it asks to set system time. I did set it and rebooted still displays the message on boot. No orange errors in LED.

Have I installed it correctly? Also if the photo isn't clear I can send some in a different angle

Hello,

we cannot see the polarity of the CMOS in the photo, but anyway, did you try to put in the other side?

Thanks

Marco