“Have You Tried Turning It Off And On Again?” – Roy.
I recently purchased a Lenovo X1 Extreme Gen 3 laptop, which I normally use on a charger – at least for the majority of the time. I recently needed to use it a few times without a charger, only to realise the second time that the battery level was down to 30% despite it being plugged in between uses. It turns out that it had decided to stop charging the battery despite being plugged into the charger. It was interesting though, as the laptop was registering that it the charger was plugged in – which was stopping the battery level from dropping further – but it was not charging. The Lenovo Vantage app and Windows both reported a healthy battery and the right wattage on the charger, but no charge activity.
I powered the laptop off and on; I tried a different charger; I tried a different OS (I have dual boot setup). None of these attempts made improved the situation. What did fix the issue however, was rebooting, opening the system/BIOS settings, and then disabling the battery. With the battery disabled, the system will then power off (the setting is designed for you to perform maintenance on the laptop). Once the laptop and battery were off, I removed the charger for a few seconds, and then plugged the charger back in and turned the laptop on. After that, it was back to charging as normal.
No idea for the moment what the issue was, but at least there’s a way to get it back to normal again.
~ Mike
Hopefully Helpful Hints // Mike J McGuire 
Probably need to replace the battery. Li-ion batteries don’t like being constantly charged. If you are using the laptop as a desktop, half charge the battery, then take it out while you use the laptop on the charger. Put the battery in occasionally, charge it up to 75%, then run it down to about 25% before charging back to 50 to 60 before removing it again. I used my laptop for five years this way, while I lived away from home on an extended contract. Battery life after 5 years was just short of where it was when new, since the chemicals age and degrade whether the battery is being used or not.
Yeah it’s an odd one. I’ve used my Lenovos for years pretty much constantly plugged in, without significant deterioration in battery life. This laptop is a few months old, so it was a little unexpected.
I’m tired, so didn’t read the original post well enough before posting. Probably worth leaving the reply as a reference, though it doesn’t actually address the issue in this case.
I have had the same issue on my 7yr old gen1 yoga and on 3rd gen yoga. both had bios updates to sort it out. it still happens periodically on my gen1. All I do is unplug it and plug it back in and it starts charging again.
PS I’m like you, my gen1 yoga is plugged in and running 24 hrs a day. Had to use it unplugged today for 3 hrs and no probs with the battery. Yes it’s not as strong as it was when new but still, pretty impressive.
I solved the same issue with my one month old X1 Extreme Gen 4 in the same way. Thank you.