Not knowing when the fuse would be blown, I had to proceed with caution. This is quite understandable, just another safety feature Lenovo build into the lithium battery I guess. So checking the PCB again I found a curious small circuit which burns a non resettable fuse when problems are detected, trashing 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 (). 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. 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. 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. The remaining capacity was 69% (good score after 2,5 years) but I need the really long battery time while travelling. The battery in my Lenovo laptop were slowly losing part of it's capacity.
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