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Lenovo released the 25th-anniversary Retro ThinkPad 25 in October 2017. The ThinkPad 25 model is based on the T470 but includes the seven-Row “Classic” keyboard with the layout found on the ThinkPad —20 Series.

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Lenovo T460 doesn't detect battery unless charger is connected

I have a Lenovo T460 with a freakish problem. The 2 batteries, one internal and one external both aren't recognized by the system.

Windows shows that the adapter is plugged in but no battery is present (which is not the case since it's actually being powered from battery and no adapter is connected)

When I connect the adapter, windows now recognizes the batteries but removes the AC adapter indicator and doesn't charge the batteries (it acts as if I had removed the adapter and not connected it, as is the case)

System specs are :

Windows 10 pro with 8Gigs of RAM, an i5 processor 6th gen and a 500GB HDD...

Things I've tried:

Power resetting by pressing and holding power button.

Removing all batteries and trying them one by one (both batteries work whether individually or together, they both power up the system).

Uninstalling AC adapter and battery drivers and restarting.

Removing all components and connecting them one by one to isolate any faulty hardware.

Cleaning the board with isopropyl alcohol ( I am knowledgeable with working with electronics hardware so I didn't mess anything up.. surely).

All of the above had no effect whatsoever... It still behaves abnormally and doesn't cold start after I turn it off. No power reaction ( possibly because it thinks there's no battery when the adapter is not connected).

However I did note that pressing the system reset hole on the underside of the board ( there is a little button close to the internal battery) the system is able to start from cold boot but only if u press that reset switch....

I know a fair amount of software and hardware but this problem is a first for me.. any insights and suggestions would be appreciated.

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Hi @neddanmaion

Check if the battery has been disabled in BIOS.

Go to Config > Power to view the sub menu disable/enable built in battery

I realize that you have performed a power reset but maybe try a full power refresh in case it is a corrupted BIOS and check if that resolves the problem.

Here’s the procedure:

a). Disconnect the charger from the laptop if connected.

b). Open the laptop and disconnect the main battery from the motherboard.

c). Remove the RTC coin cell battery (aka cmos battery) from the motherboard.

Here’s the hardware maintenance manual for the laptop. Go to p.74 and p.75 to view the the procedure to remove main battery and the RTC coin cell battery.

When the RTC battery is removed measure its voltage. If it is <2.6V DC replace it. The part number for the battery is 02K7078 or 04W1642 (there are a lot more but one of these two should find suppliers). Search online using the part number only to find suppliers that suit you best

d). Press and hold the laptop's Power button for a full 30 seconds and then release it.

e.) Reconnect the RTC battery (or its replacement).

f). Reconnect the main battery and reassemble the laptop.

When the laptop is completely re-assembled, connect the charger and try to turn on the laptop.

If it starts OK there may be a message about the date and time being incorrect. This is normal as the BIOS has been completely reset back to its default settings. Once the date and time have been adjusted the message won’t appear the next time that the laptop is started.

If you had previously changed any user defined settings in BIOS to suit whatever specific hardware configuration that you had for the laptop, then these will have to be set again.

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Alright, thanks for the reply @jayeff, I will try those steps and post the results. I did remove the RTC battery before but I didn't pay much attention to the voltage and battery P/N. So I'll try it again following the steps you provided and see what happens.

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@jayeff, So here's the results of what happened after following the steps...

The system now properly recognizes the AC adapter. However both batteries are dead after the procedure. They don't power on the unit and they aren't being charged. Windows reports that it's plugged in but both batteries are stuck on 0%.

I know Lenovo batteries can be naughty but both batteries out at the same time?. I think there's more than meets the eye here..

What are your thoughts on the results?

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@neddanmaion

Create a battery report to check that status of the batteries.

This is just to see if they're being read properly.

Compare the design capacity versus the full charge capacity values.

If they are being read correctly the design capacity should be the stated mWh value of the battery

So was the battery's BIOS settings disabled, you never said?

Two batteries out at the same time may be possible if the following scenario happens but this is only conjecture on my part.

If one battery was disabled in BIOS and the laptop was being operated by the other, since you said that it acts as though the AC charging is turned off then the battery that was running the laptop eventually goes flat as it wasn't being charged and neither was the one that was disabled.

What happens if you just leave the laptop on charge for a while, do the batteries start to charge? By a while maybe leave for an hour or two as sometimes when batteries are flat they have to be coaxed back into life and leaving them on charge even though they appear initially not to be charging can kick start them back into life again.

Worth a try anyway as it only costs you a bit of time. However don't leave them on charge overnight unattended so to speak. It's never good to charge batteries unsupervised.

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@jayeff

Yes I did forget to mention, the internal battery was not disabled in bios, I tried to enable/disable just to be sure it was online in the bios.

About the battery report, how do I generate that in windows? There isn't any Lenovo vantage software installed and the only way I know how to get that is from Linux which I currently don't have at the moment.

Currently I left it plugged in to see if it does try to charge the battery. When you connect the battery after windows is already running, it shows the charging animation for a while then stops but it doesn't say it's "not charging", it just says "0%, plugged in".

So I'll leave it for a while and report if anything changes.

Also, it's entirely possible that the laptop could have discharged and flattened out without me noticing so... Fingers crossed that leaving it on AC will kickstart something.

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@neddanmaion

Click on the blue "battery report" link in my comment above to view how to create the battery report in Windows.

It is old time computing, you can only use the keyboard when in a Command window because the mouse won't work inside the window.

If you make a typing error you need to use the backspace key to step back and delete the characters until you reach the error and then start typing again

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