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.
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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:
Re: reset bq8030 sanyo with battery lenovo by lucyvietnam » 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.
- 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.
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.
After waiting for a night the cells from the old and new pack had the same voltage. To keep the protection circuit from detecting the change in batteries I would need to keep the pcb powered with the old batteries until the new batteries were connected. Luckily Lenovo provided some testpads right next to the places where the batteries are connected to the PCB. So I soldered wires between the testpads and the tabs on the old batteries.
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Then I slowly started to dismantle the old battery pack for the solder tabs connected to the pcb. It takes a bit of force, but you can get the tabs off in reasonably good shape.
And I attached them to the new batteries by soldering them together with a really thin layer of solder. The plastic seperators from the old pack were also reused.
Added some new double sided tape to the old plastic casing and put the batteries in:
I Soldered the tabs to the PCB again, taking good care not to short circuit anything. Then desoldered the wires running to the old battery pack and done!
At the moment the laptop is still charging (says there were only two minutes of charging left for about half an hournow). Hopefully Hackaday projects will let me post an update, don't know about that yet.
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After a few charge/discharge cycles, the total charge according to the battery gauge is still stuck at 61.21 Wh. It should be about 3*3.7*3.4*2=75.5 Wh. If you disable all the low battery hibernate and sleep timers, the laptop will beep like mad when according to the battery gauge 0.25Wh is left in the battery. Then the laptop happily keeps running for about one hour.
Probably there is a software programmed capacity limit about 4Wh larger than the designed battery capacity (stuck at 57.72 Wh).
Sadly there is no way to tell when the laptop battery will deplete completely, except for watching the battery voltage closely. I did find this nice program called Battery Care which can show the battery voltage. I might even convince the maker of the program to put in an alarm/warning system based on battery voltage.
So partial success on this hack. Anybody in for some battery gauge reprogramming via SMBUS action?
Some research has already been done into the subject of resetting the BQ8030, but no real progress so far. You can even buy a Sanyo battery reset tool (LINK), but don't have 3200usd to spare. O well, the batteries will wear out enough in about two years to reach the 61Wh limit again....
“Is there any type of software that can repair corrupted JPEG photos? Recently I stupidly deleted some photos I shouldn’t have. I did a photo recovery. Some of my photos were recovered, but the ones I wanted came out corrupt. How do I fix corrupt JPEG files so that I can see them perfect?”
You may have accidentally deleted or lost photos from hard drive or memory card. In most cases, photos can be recovered with proper data recovery software. However, there could be a chance that when you recover a deleted JPEG picture, every though it’s been 100% recovered, it has been damaged or corrupted, and you can’t view it. This usually happens if some new data has previously been overwritten or that specific area of the drive/card has bad sectors.
How Were JPEG Photos Corrupted?
It is important to identify how your photos were corrupted out of several possible occasions. Sometimes you can’t open the images with any photo viewer, while in other cases, you can only open a half of the images with the other half illegible or blank. Hence, the content below may guide you how to choose a corrupted JPEG file repair software.
1. JPEG images corrupted during transfer
File transfer between different storage devices could be interrupted easily by various factors. That’s why many people find the destination folder empty or only a few files successfully transferred. If you started the transfer with cut and paste, then it would be almost impossible to recover photos or files lost. If you did it with copy and paste but deleted the original copy later, then there is still a chance to restore JPEG photos and videos with Jihosoft Photo Recovery, or the top free data recovery software.
2. JPEG photos corrupted after recovery
If the files cannot play normally after recovery, then they might have been corrupted due to data overwriting or reformatting. That’s when you really need a proper JPEG repair tool.
3. JPEG photos only display a half
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This is a common case that a lot of people have encountered. When you open a corrupted picture with a photo viewer, only the first half is normal. It could happen after data recovery or due to a fake memory card. In this case, you can also try the tools below to repair broken JPEG.
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There are many free & paid JPEG repair tools available to repair corrupted JPEG photos and make them viewable. Even the paid ones usually allow free preview for the repair result, so you may try several options listed below to see if any one works.
Stellar JPEG Repair ($39)
It is a powerful tool to help you repair damaged or corrupt JPEG/JPG photographs. In addition, it supports extracting and repairing thumbnails of the selected .jpg files. You can preview the repaired JPG photos before you decide to take them back. JPG files which were completely unreadable can be opened by any popular image viewers after the repair.
File Repair (Free)
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File Repair is fast and stable, no ads and no beg screens. It is perfect for repairing damaged or corrupted JPEG files, which can scan corrupted JPEG files and fix an impressive number of errors. It is very simple-to-use, with just 2 buttons: load and repair. However, you cannot load multiple JPEG files at once. Besides, no drag and drop files are allowed.
VG JPEG-Repair (Free)
VG JPEG-Repair is a German utility that helps to repair broken images in a JPEG format. It is very easy to install and simple to use, which works to solve if the JPEG file can’t be opened, corrupted head, corrupted data, and invalid structure. Not that this tool is supported only on Windows Operating System.
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RS File Repair (Free)
RS File Repair can repair damaged, corrupted and incomplete files and digital pictures. It supports fixing digital images in popular formats including JPG, JPEG, TIFF, TIF, and PNG etc. It can make your JPEG files viewable once again by analyzing the damage, fix corrupted file structures and returning the files back to original specifications.
JPEG-Repair Online Tool (Free Trial)
JPEG-Repair is an online tool which allows users to upload damaged image files as well as a not damaged example image from the same device. It will exact necessary data from the example image so as to repair the corrupted image. The trial version is valid in 24 hours for a limited file size up to 30 MB.
Verdict
It is really hard to repair corrupted JPEG files, so you’re not suggested to expect too much. Please evaluate the severity of the damaged images, then try the tools above to fix your photos. If none of the options works, there is almost no chance elsewhere. Don’t forget to let us know if any software repaired your JPEG files.