Author Topic: Lenovo laptop battery pack  (Read 534 times)

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Offline tomeo.gonzales

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Lenovo laptop battery pack
« on: February 25, 2019, 10:44:26 pm »
Hi,
Can anybody identify the integrated circuits from this Lenovo laptop battery pack?
 

Offline Jwillis

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Re: Lenovo laptop battery pack
« Reply #1 on: February 25, 2019, 11:19:49 pm »
bq8030 is an EProm for battery management .contains firmware , bq29330 is Two, Three and Four Cell Lithium or Lithium-Polymer Battery Protection AFE http://www.ti.com/lit/ds/symlink/bq29330.pdf
 

Offline Jwillis

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Re: Lenovo laptop battery pack
« Reply #2 on: February 25, 2019, 11:26:48 pm »
As a side note.If your pack isn't charging it's likely a bad cell.It only  takes one cell to be a little off for the management circuit to disable the whole pack. This is a safety thing incorporated in all lipo battery packs to prevent possible explosion or fire  caused by bad cells. Although new cells can be installed and the management system can be reset its often more economical to just replace the pack.     
 

Offline tomeo.gonzales

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Re: Lenovo laptop battery pack
« Reply #3 on: February 26, 2019, 02:22:11 pm »
Thank you Jwillis.
I plan to use the circuit with new cells as a power source for a 10V reference.
And a LT3042 as low noise linear regulator ahead of reference
 

Offline GeoffreyF

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Re: Lenovo laptop battery pack
« Reply #4 on: February 26, 2019, 02:28:21 pm »
Thank you Jwillis.
I plan to use the circuit with new cells as a power source for a 10V reference.
And a LT3042 as low noise linear regulator ahead of reference

Plan on a fire extinguisher and sand bags around your project while you charge it.   Read up on LiOn charging.   I did not see, charging current, or,  matching your new cells charging curves to the old ones,  in your thoughts.  Actually getting a charging circuit that goes with your new cells would not be that much more expensive than re-purposing an old circuit board with chips you can buy for a few bucks.
US Amateur Extra W1GCF.
 

Offline tomeo.gonzales

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Re: Lenovo laptop battery pack
« Reply #5 on: February 26, 2019, 05:35:23 pm »
Thank you for your advice.
Maybe it will be better to buy a 12V battery pack with dedicated charger.
 


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