T495 3300U refuses to switch over to battery when unplugged
crwdns2934249:0crwdne2934249:0:
This was a headache since I got the laptop used at a pretty cheap price 2 years ago, I thought, "hey 70 bucks Canadian for a mint T495 with a dead battery? This is a simple fix!" [br]
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Anyways when plugged into a good USB c 100W PD charger, I see the laptop actually charges up the battery. Windows 11 shows the battery charging to 100% and the battery health is good. [br]
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I can see on my charger that the watts consumed thorough the USB C port goes down once the battery completes charging fully. [br]
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BUT when I unplug the laptop from USB C, the laptop shuts down completely. It refuses to use the fully charged battery. [br]
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Its not an OS issue as the device will switch off immediately when there is no OS loaded as well. [br]
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The lenovo vantage app doesnt help at all, if I remember correctly the system even correctly limits the battery charge to x% when requested in the app, so most of the battery management features still work.
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When I first bought the laptop I thought "oh its just a dead battery" I bought a new 3rd party battery from Amazon, replacing the OEM battery, and the device behaves the exact same showing the same symptoms. ⏎
I've disconnected and reconnected the battery connectors, and all other motherboard connectors, cleaned the connectors out with 90% rubbing alcohol, I;ve used the "battery disable for servicing setting" in BIOS, Ive removed the CMOS battery, the main battery and USB C power and left it sitting for a week, and no change. I've reset all BIOS settings, and upgraded the BIOS and downgraded the BIOS, I've pressed that one small SMD button on the motherboard that I thought was some sort of servicing button while the power was on, while it was unplugged, while there was no sources of power connected to the mobo, no change. [br]
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I think theres some sort of switching circuitry on the mobo thats defective, besides the refusal to use the fully charged battery, the laptop performs completely fine in every other aspect. [br]
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=== Update (07/14/25) ===
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Edit:
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Ironic as soon as I posted this, I saw a post on Kijiji for a T14 Gen 1 Motherboard with the Ryzen 4650U CPU and 16gb of ram for 50 bucks, and it was a perfect drop in replacement :)[br]
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Had to wait 2 years for it lol[br]
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I am going to repurpose the 3300U T495 motherboard as a Desktop mini PC since the battery circuit is flawed
T495 3300U refuses to switch over to battery when unplugged
crwdns2934249:0crwdne2934249:0:
This was a headache since I got the laptop used at a pretty cheap price 2 years ago, I thought, "hey 70 bucks Canadian for a mint T495 with a dead battery? This is a simple fix!" [br]
[br]
[br]
[br]
Anyways when plugged into a good USB c 100W PD charger, I see the laptop actually charges up the battery. Windows 11 shows the battery charging to 100% and the battery health is good. [br]
[br]
I can see on my charger that the watts consumed thorough the USB C port goes down once the battery completes charging fully. [br]
[br]
BUT when I unplug the laptop from USB C, the laptop shuts down completely. It refuses to use the fully charged battery. [br]
[br]
[br]
Its not an OS issue as the device will switch off immediately when there is no OS loaded as well. [br]
[br]
The lenovo vantage app doesnt help at all, if I remember correctly the system even correctly limits the battery charge to x% when requested in the app, so most of the battery management features still work.
[br]
When I first bought the laptop I thought "oh its just a dead battery" I bought a new 3rd party battery from Amazon, replacing the OEM battery, and the device behaves the exact same showing the same symptoms. ⏎
I've disconnected and reconnected the battery connectors, and all other motherboard connectors, cleaned the connectors out with 90% rubbing alcohol, I;ve used the "battery disable for servicing setting" in BIOS, Ive removed the CMOS battery, the main battery and USB C power and left it sitting for a week, and no change. I've reset all BIOS settings, and upgraded the BIOS and downgraded the BIOS, I've pressed that one small SMD button on the motherboard that I thought was some sort of servicing button while the power was on, while it was unplugged, while there was no sources of power connected to the mobo, no change. [br]
[br]
[br]
I think theres some sort of switching circuitry on the mobo thats defective, besides the refusal to use the fully charged battery, the laptop performs completely fine in every other aspect. [br]
[br]