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shamoke
Paper Tape
Posts: 5
Registered: ‎01-10-2012
Location: United States
Views: 1,098
Message 1 of 3

T420 battery goes straight to critical.

My battery would randomly go to critical all of a sudden. It goes from 70% then to 5% after an hour of standby. I doubt an hour of standby will drain 65% battery. A couple seconds after resuming from standby, lenovo and windows battery meters shows the sudden drop. I get a warning of critical battery and the computer auto-shuts off.

 

I don't know why this happens. My drivers are all updated. I reset my battery last month. This battery only has 15 cycle count while my old t61's battery had over 200 and was 4 years old without battery problems. Could it be a possible defective battery? This doesn't happen often but when it happens once every 3 or so weeks, it's extremely annoying.

Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 1,092
Message 2 of 3

Re: T420 battery goes straight to critical.

Does it drain normally if you use it from 70% to 5% or does it also do a sudden jump?

W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
shamoke
Paper Tape
Posts: 5
Registered: ‎01-10-2012
Location: United States
Views: 1,078
Message 3 of 3

Re: T420 battery goes straight to critical.

Normally drain. 

 

But should note there were also a few cases where it would jump during use and not during standby.

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