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3 lead cr2032 cmos battery.. Uhm. Why?

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SantaClaw:
So, I was about to replace the cmos battery in my Dell XFR E6400... and it's a regular cr2032, but it has three wires?

 MISC-S0479-1__13855.1526517166.JPG (99.26 kB - downloaded 263 times.)

Any clues as to why? It seems to have two negative leads..

https://www.upperedgetech.com/dell-3-prong-bios-battery-cr2032-3v-210mah-gc020012s00-latitude-e6510/

ataradov:
210mAh implies that it may be a rechargeable battery, so extra lead is probably a temperature sensor.

SantaClaw:
No, it was not a rechargeable battery, it was regular Maxcell cr2032 lithium, 3V, it's not a temp sensor either, both wires are connected to the negative side of the battery. I ripped the spot welded leads off and soldered them onto a new fresh cr2032

Old battery held a charge of about 1.5v

ataradov:
In that case it is probably to make it universal. So that you could use a rechargeable battery and a primary cell with the same connector.

SantaClaw:
I bet you are right. That would make sense. There is no room for any other type of battery than a coin-cell.

I think the rechargeable 2032's are called ML2032 if they are 3v?

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