- Feb 13, 2010
Such an investigation !
Going for it.
Going for it.
I think I've got it figured out. (...lotsa interesting techy stuff...)
My current theory is that the smart charging, with it cycling up and down around 95% to keep the battery from overheating, is slowly causing the bq chip to think there's less and less capacity even though it isn't true. It needs a good deep cycle every once in a while to remind it what an empty battery looks like. I'm going to ping this idea off the TI tech as soon as I confirm my battery is cycling properly again.
So does this mean the current HF6 charging algoritm is bugy and hurts the Battery? Damn.
Sacre blue, it work. Deleted appdata for keepnote and now its running again. Thanks.^ In the case of such issues with PNDs, you should try removing the appdata entry for the ones that you're having problems with (remember to back up preferences or files you want to keep that are in the appdata directories, though!). Some others have reported the same with Hotfix 6, and have said that this fixed it for them.
If that fails, checking for an updated PND is the next step to take.
I'm not sure how to get the battery fully discharged. I disabled the 'turn off device' from the battery monitor and left it on 'low-power mode' for about a day now, but it seems to stick around 4%I think I've got it figured out. On advice from TI, I did a complete cycle to recalibrate. A complete cycle apparently requires a full charge, sit at 100% for 2 hours, then a full discharge below 3.0 volts and left for 5 hours. It was the "leave it empty for 5 hours" part I didn't know about. It's taken me the better part of the weekend to get to this point, but preliminary results are very favourable. I'm going to try one more full cycle to 100% and back down and see if it approaches zero this time. The TI tech suggested it may take a few complete cycles for it to really learn where zero is, but if it even comes close this time I'll be happy.