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Old 01-14-2013, 09:52 AM
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Location: San Francisco
Join Date: Aug 2009
Posts: 10,410
Mein Auto: 2009 E93 N54
Originally Posted by emh View Post
Figuring out how to charge a battery of "unknown"* construction and capacity doesn't require black magic -- every manufacturer has been doing this for many decades now. And it's not like the IBS is significantly extending battery life over other cars. I'm guessing the complexity is in managing the various systems that run off the battery to minimize drain when the battery is nearing end of life. Even that is not unique to BMW.

Still, if a system wants to be intelligent about batteries of "unknown" construction and capacity, a feedback mechanism that monitors how the battery responds to whatever the system does, without requiring manual intervention, would be the right thing to do.

* They aren't really unknown construction and capacity, right -- as long as the manufacturer specifies what kind of battery to use, that narrows down the parameters greatly.

So, how's that done on an in-service battery? Or not done, of course - BMW supplies specs; we're expected t'adhere. Know how to check when battery's not in service, but how to have the CPU check when battery's installed & buttoned up.....
  • Mfg declines to add vehicle weight & mfg expense with load tester
  • Vehicle could easily check battery at every power down w/certain additions
If not exactly a match, provision's there for variance. Ya just gotta tell the ECU, battery adapter CPU, or whatever.


Last edited by CALWATERBOY; 01-14-2013 at 09:53 AM.
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