X200, X201, X220 (including equivalent tablet models) and X300, X301 series specific matters only.
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I have been using my X220 since 2011 (9 years), at least 95% of the time in an Ultrabase 3 (i.e., on AC) with the battery in the machine. To this day, I have never seen any sign that the CMOS battery is not working. How long can I expect it to last, given that almost all the time I am working on AC? Should I put in a new one, preemptively, before the original one dies?
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The usual CMOS life expectancy is about 5 years, but can be a lot longer.
As long as the voltage is between ~2.95V and ~3.3V, you're good to go.
If/when you replace it, check that there is no password set in BIOS (or that you know it)!
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As far as I know the battery in my T520 has never been replaced either and it's still ticking along. That goes for my two T510's and T500 too.
T500 T9600 2055-BE9
T510 i5 4384-DV7
T510 i7 4349-A64
T520 i7 4242-4UU(CTO)
T520: i7-2760QM(2.40GHz),16GB, 500GB SSD/250GB SSD, 1600x900, 1GB NVIDIA, DVDRW, Smartcard, media card, FPR, Win7 Pro64, XP Pro64 whitelist BIOS, N 6300 AGN, German KB, BT 4.0.
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The CMOS battery in our T410 is ticking alive and well
From our empirical observations, it is when you fully discharge your main battery, and then let your computer sit there unused (and unplugged) for months at a time.
ie: computer uses the CMOS battery to maintain itself.
That's when your CMOS battery is in danger. Just our two cents.
Daily Driver: X1 Extreme 1st Gen (X1E1): i7 | 16GB | 1TB | IPS
Current Thinkpads: X1E1 | X1C4 | X1C3 | X250 | X230 | T410
Retired Thinkpads: T42 | 560 (circa 1996)
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The CMOS battery of my T42 and T43/p's all died about 1-2 years ago. So about 12-13 years in my usage.
T23 PIII 1.13ghz 1gb W7
T43 15" 1.86 XGA 2gb fp W7
T530i 15.6" i7 16gb fp W10
A30p PIII 1.2 1gb W7 (IDTech)
T43p 2.26 2gb fp W10
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