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T450s external battery not recognized

2020-09-17, 21:27 PM

I've got a T450s with no internal battery and a 6-year old external battery.  Even if the battery will not hold a charge I'd expect it to be recognized.  Any ideas?  I've tried the reset procedure and installed the software below.

 

Lenovo Power Management Driver for Windows 10, 8.1, 8, 7 (32-bit, 64-bit) - Laptops

Lenovo Settings Power Manager for Windows 10 (Version 1703 or Later) - ThinkPad

 

The external battery is 6 years old.

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12832 Posts

06-06-2011

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T450s external battery not recognized

2020-09-18, 11:36 AM
Make sure the battery is Lenovo genuine. Despite the battery' "age", if it has the charge/discharge cycles count value too big (for example, 350...400 and more) or/and was at very low charging state (discharged completely) for a long time, it could be unrecognized be the laptop firmware.



x220 • Gobi 2000 3g | hdd, msata ssd, wwan, wifi, gps -- unique hand-made config
ThinkPad 25 Special Anniversary Edition. #Retro. Signed by D.Hill
T470p | X1 Carbon Gen3 | Miix 2 10" | Yoga Tablet 2-1050F (Android) + BT Keyboard
ThinkPad Stack • 2.4/5 Wireless Router, HDD 1 TB, BT Speaker, Power Bank, Mobile Projector

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T450s external battery not recognized

2020-09-18, 15:38 PM
Since the battery is not recognized, I have no way of counting the cycles. But, given its age maybe it has exceeded some limit and that's the cause.
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Re:T450s external battery not recognized

2020-09-18, 23:03 PM

If you unsure whether the battery is Lenovo genuine provide its surface with stickers/symbols to check them out.



x220 • Gobi 2000 3g | hdd, msata ssd, wwan, wifi, gps -- unique hand-made config
ThinkPad 25 Special Anniversary Edition. #Retro. Signed by D.Hill
T470p | X1 Carbon Gen3 | Miix 2 10" | Yoga Tablet 2-1050F (Android) + BT Keyboard
ThinkPad Stack • 2.4/5 Wireless Router, HDD 1 TB, BT Speaker, Power Bank, Mobile Projector

Do it well, worse becomes itself

Communities:   English    Deutsche    Español    Portugues    Русскоязычное    Česká    Slovenská    Українська   Moto English

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Re:T450s external battery not recognized

2020-09-19, 13:48 PM

Double check if contacts are clean (Maybe use some contact cleaner like WD40 a little).

 

It could be the controller is relying on a charge in the battery in order to accept new AC charge or being able to comminicate at all. If the battery is fully flat the controller chip inside the battery might not be able to even start up anymore, noticing the AC charge, and accepting it. But this is just a idea. Personally I would design the controller in a way that it also could run of external AC power ;)

 

What ya can try (Disclaimer : Just an idea, it could damage your battery) is warming the battery up in some way. Put in in the sun for half an hour, or blow it a bit with an hair dry-er so that it is about 30-45°C. It might accelerate the chemicals just enough to produce a high enough voltage for the controller to run again and be able to read it out, or even maybe accept charge again.

 

Remember that if it really is flat the battery migh already be seriously damaged, getting it revived again after a flat chage might highten fire/explosion risks.

 

 

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Re:T450s external battery not recognized

2020-09-21, 0:03 AM

I've ordered a replacement.  Given the age of this one, that might be the case that it's just too "gone" to be recognizable.  

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Re:T450s external battery not recognized

2020-09-21, 7:15 AM
The battery looks Lenovo genuine, I don't see the fake features.



x220 • Gobi 2000 3g | hdd, msata ssd, wwan, wifi, gps -- unique hand-made config
ThinkPad 25 Special Anniversary Edition. #Retro. Signed by D.Hill
T470p | X1 Carbon Gen3 | Miix 2 10" | Yoga Tablet 2-1050F (Android) + BT Keyboard
ThinkPad Stack • 2.4/5 Wireless Router, HDD 1 TB, BT Speaker, Power Bank, Mobile Projector

Do it well, worse becomes itself

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Re:T450s external battery not recognized

2020-09-21, 13:19 PM
I've ordered a replacement. I was trying to think about what things the person doing the screen repair earlier might have done to cause this behavior. Like leaving something internally disconnected. But the connector for the external battery seems to be part of the system board. I could not find any loose wires other than one that seemed to be an antenna. It' just that the battery worked fine before that repair.
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Re:T450s external battery not recognized

2020-09-29, 15:30 PM

So.  For some reason, in MY case, without an internal battery, the external battery is not recognized.  I installed a new internal battery and now both are recognized.  So I guess the external was good afterall and this model requires an internal battery at a minimum.  

 

BUT

 

I also ordered a replacement external battery.  Turns out it's a larger capacity version with rubber feet on it which is nice.  The label is identical to the one above except for recent date markings and the mAH rating.  This battery is "randomly" recognized.  Sometimes it's shown and with the laptop not being touched at all will disappear from the battery status popup.  

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