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.. So checking the PCB again I found a curious small circuit which burns a non resettable fuse when problems are detected, trashing the battery.. 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.

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.

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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).. This is quite understandable, just another safety feature Lenovo build into the lithium battery I guess.. 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. Prefectdisk 8.0 Crack

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Discover Schneider Electric range of products in Motor Starters and Protection Components: TeSys K,TeSys D,TeSys F,TeSys B,TeSys SK and SK GC Mini-Contactors,TeSys Control Relays,TeSys GC, GY, GF,D range,TeSys LF,Motor Starter Combinations K Series,TeSys LE Enclosed Motor Starter,TeSys LG, LJ Enclosed Safety Starters,E.. Back home, I first made sure both batteries had about the same voltage, the bad banana plug wires I used had enough resistance to keep the balancing current under 1A.. 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. Adobe Acrobat 9.3 Professional Mac Download

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