The battery in my Lenovo laptop were slowly losing part of it's capacity. The remaining capacity was 69% (good score after 2,5 years) but I need the really long battery time while travelling.
- Aug 13, 2013 Re: reset bq8030 sanyo with battery lenovo by lucyvietnam ยป Wed Nov 06, 2013 4:36 am sanndo wrote: i have same problem with lenovo sanyo battery. The reason is so simply dont ever remove fuse and solder jump on it! Just solder 30-50ohm resistor as fuse. And battery will work now.
- Highlight and press Settings/Tools Tools Update Phone Update Firmware to search for and download available updates. Out er N avig tion K y ey 1. Proximity Sensor 2. Internal Antenna 18. Charger/ Accessory Jack 12. Power/Lock Button 13.
![Remote Remote](/uploads/1/2/8/4/128432267/999023461.jpg)
The battery statistics according to Lenovo power utility:
So, I bought some Panasonic NCR18650B Cells (3400mah) for 6 euro a piece (can be bought cheaply here in China, just watch out for fakes) and decided to put them in. Theoretically Increasing the capacity from 69% of 5.6 Ah = 3.86Ah to 6.8Ah, a 76% increase in battery life!
After breaking the casing I saw a really nicely designed and built battery pack. Being curious about the IC's on the PCB I searched online and found two trustworthy IC's from Texas Instruments doing all the hard work:
- bq29330, a lithium battery protection IC
- bq8030, a lithium battery gauge, to keep track of the amount of charge left in the battery.
By chance I also found a site where they tried to refurbish a battery pack from a Lenovo battery pack and it did not work because of safety features on the PCB (link).
So checking the PCB again I found a curious small circuit which burns a non resettable fuse when problems are detected, trashing the battery. This is quite understandable, just another safety feature Lenovo build into the lithium battery I guess. Not knowing when the fuse would be blown, I had to proceed with caution. Thanks allaboutcircuits, for not letting me end up with a busted battery pack!
You cannot just solder wires to lithium-ion cells, they will just overheat and might even explode! Luckily at the moment I am living in Shanghai, so I went to a small electronics factory and spot welded some connections to the batteries (I did it myself) and connected them together in a 3x2 batteries in series way.