Caution on fully charging bmw e70 battery

[andrewwynn]

Here are the stats for my car.

As you can see most of the hours are spent from 60-80 but quite a lot are spent in 80-100.

My experience is the charge state is usually 80 ± 5%.

Most systems on the car use regulated voltage so you don't get dimming lights etc.

I have LED interior lighting so it doesn't change depending on voltage

[Crowz]

Actually all I see is just a tad over 82% which is wonderful... for a lithium battery. Not for an agm or lead acid battery.


Having done solar setups for several years I don't want to see those figures even if correct on a car battery that is supposed to be fully charged. Also I want my accessories to perform at full power too.


But again that's just me. I don't agree with their take on tinkering with the voltage.


The rear motorized hatch had even stopped opening one day at a grocery store in 5 degree weather when the car wasn't running. I had to close it and reopen it again. I imagine if I had of had the ibs disconnected around that time it wouldn't of happened.



I don't make long trips anymore and the car sits for long periods. I use a battery maintainer to keep it charged when not in use.


Disconnecting a fully charged battery and going somewhere and coming home and the battery being less charged than when I left is just dumb. Yes starting a car pulls it down a bit but were talking .1 volts tops and leaving with 12.8 volts in the battery and coming home with 12.37 to 12.5 is just wrong.


My E53's don't do that.



Also accessories one uses in the car should be provided with the correct voltage at all times while the car is running. The ibs system does not do that.


Again to each their own.