![]() ![]() As for safety, people seem to love to tell scare stories about lithium ion batteries. It seems like a lot of this battery pack rebuilding happens in China and Russia, and eastern europe, so you may have the best luck searching for pack part numbers, and even the specific models of battery management ICs you find inside, then using google translate. They may use the same code across brands of laptops, and they leak out. I also get the sense that in many cases, the unseal codes are set not by the laptop makers, but by the "packers," the companies that assemble the packs from cells. At one point, Apple used TI's default for the password to "unseal" their packs. My impression is that some companies are more aggressive about locking down their laptop batteries than others. I also came across, a Chinese site that specializes in stuff for battery rebuilding. It seems to have some relationship to B2EWorks, but I don't really understand how they are connected/related, and why the prices are so different. ![]() In addition to B2Eworks, there is also this software. I'm not really interested in rebuilding packs, but I have some across some information. I'm interested in harvesting cells from laptop batteries, and have done some work to read out useful data from packs. In the case of a laptop, consider building an external power supply pack and run the laptop via its charge socket. These are the times in which we now live. It's a medical headset so they can charge what they like and also protect against unauthorised re celling. The battery packs are something like $700 each for an 1850 cell, $10 of electronics and a fancy case. The chip has no other defenses and can be reset but the reset kills the PIN number anyway. Those two battery packs are now scrap unless I manage to re program the PIN number into the management chip. I have two good battery packs and two where the management chip shut the Pakistan down and erased the PIN number. Fine except the pin is deliberately held in volatile memory and is erased if the cell fails or is disconnected to replace it. ![]() The battery management IC contains a PIN number that is read by the headset at switch on.no pin = refusal to start. I have an expensive binocular video headset that runs from a single easily replaceable 18650 cell. The battery management can also be clever enough to spot a cell that has characteristics different to others and will once again lock down the battery so that it cannot be used. It's all about anti piracy and safety protocols. The greater issue is that many of the controllers require a PIN number that you will be unlikel to find out as even official service techs do not have it. Some lock when a cell fails others do not. The BQ controller chips come in several types. ![]()
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