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Having gone deep down the rabbit hole of researching smart laptop battery controllers I've ended up reverse engineering a couple of them used in ThinkPad batteries. Looking around there's very little software available out there for working with battery controllers in general and most of them cost hundreds or even thousands of dollars. 0/SLUU225 datasheet, cross reference, circuit and application notes in pdf format. Usually the chips' datasheets aren't even publicly available. (Aside from a few outtakes from chinese developer forums) So why would you want to mess with a smart battery controller anyway? Consider the case of one ThinkPad X100e I purchased a few months ago.

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Battery dead. Querying the controller reveals it's had 43 charge/discharge cycles so the cells are practically new! And yet the controller was in permanent lockout mode due to a single overdischarge condition getting logged.

Trying to charge the battery in the laptop resulted in a rapidly flashing charge LED indicating charge failure. Some people will say 'Well that's by design, a single overdischarge turns Li-Ion cells into potential fire-bombs!' If that was true there would've been a lot more cases of batteries setting houses on fire back in the early 2000s as '0V deep discharge recovery' used to be a feature in some laptop battery pack controllers back then. It's not nearly as bad as some urban legends would have you believe. Clarification: True 0V discharge kills Li-ion cells and you shouldn't attempt to recover them.

The old controllers tried to fix over-discharged cells and they succeeded in the majority of cases because you rarely have a true 0V scenario unless you have a shorted cell or something. The new controllers on the other hand happily commit suicide at over-discharge voltages where cells are still easily and safely recoverable with little to no capacity loss. Take the battery pack I mentioned above for example. After recharging the cells externally while carefully monitoring their temperature and reprogramming the controller the pack was fine. It ended up with 100% the design capacity lasting 3.5 hours (it's a power hungry AMD system with an ATI GPU) For the manufacturer, taking no chances from a legal standpoint is understandable but sometimes they can go a little overboard.

A 3.5hr battery ending up in a landfill is not the best outcome. Cummins Insite Password Keygen Generator Software. Another reason would be for re-celling the pack. You have some options when the battery of your laptop dies: Replace the whole shebang because it's too slow anyway, replace the battery with a factory one for $100+, buy a chinese knockoff for $20-50 or re-cell with good brand cells for $20-50ish. As demonstrated in my about laptop batteries, keeping the original controller board has certain advantages such as temperature monitoring and an extra safety feature.

It's also a good bet that brand cells will survive more cycles without capacity loss than ChangJiang ones. (I've actually recently tested a 6-cell LG pack at 540 cycles and it held a 1.5Amp load for 80 minutes. A ChangJiang pack at 230 cycles petered out at 50 minutes. A sample size of two and the CJ pack was lower capacity to begin with (4.4AH vs 5.2) but still.) Ok, so how do you talk to these controllers?

SMBus, which is I2C's impatient cousin with nasty hard timeouts and bulk transfer modes not standard in I2C along with a RESTART condition in addition to the START and STOP you normally deal with (. Or just 1-Wire in more exotic hardware but let's not think about that). How nasty are the timing constraints? You can implement I2C through a USB serial dongle's flow control pins. You can't implement SMBus because your code, the windows API, driver, USB stack and controller firmware response overhead added up is over the limit (especially if your serial thing uses only USB1.1). You can't keep the clock idle for over 35 milliseconds or the controller drops the conversation.

But don't go TOO fast because SMBus can't go over 100Khz (I2C can do 400). All that rushing and it can't keep up the pace in the long run, figures. Unfortunately this makes it cumbersome to implement a dumb SMBus interface on a non real-time system like a PC alone (not counting the actual interface between the EC/SMC and the SMBus devices in the system which is usually not accessible directly and/or isn't usable for more involved operations) Did I mention that different controllers seem to have slightly different timing requirements? The most well supported interface for speaking with smart battery packs is the Texas Instruments EV-2300. It's a fairly expensive piece of kit but it has the advantage of being able to work with TI's own software which has a myriad of options for the publicly available TI battery controllers running the TI firmware but more on that later.