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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > increased battery discharge



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      01-16-2014, 10:11 AM   #1
335twins
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increased battery discharge

I am seeing "increased battery discharge" on my idrive screen, i drive 20 miles a day, not much, does this mean that my battery is still good? should i have it checked out at autozone or something? Any good alternatives if i need a new battery?

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      01-16-2014, 12:36 PM   #2
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The battery may be just fine. I get that same message almost every day. My service adviser says I should go for longer drives so the battery has time to recharge, but that's ridiculous - my commute to work is 10 miles and I've never had a car that couldn't maintain adequate charge with that. A few times I have placed a trickle charger on the battery overnight to make sure it's fully charged, but two or three days later the message reappears, even though both the battery volatge and charging voltages are right where thety should be. At this point I simply ignore the message. The car has no issues cranking, even in very cold weather, so I figure the root cause is an over-conservative computer programmer. My advice is check the battery voltage - should be 12.6V with no load, shouldn't drop lower than about 10V when cranking, and about 13.5V or more when being charged by the alternator. If these readings are OK then you should be fine.
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      01-16-2014, 02:22 PM   #3
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Quote:
Originally Posted by ChipB View Post
The battery may be just fine. I get that same message almost every day. My service adviser says I should go for longer drives so the battery has time to recharge, but that's ridiculous - my commute to work is 10 miles and I've never had a car that couldn't maintain adequate charge with that. A few times I have placed a trickle charger on the battery overnight to make sure it's fully charged, but two or three days later the message reappears, even though both the battery volatge and charging voltages are right where thety should be. At this point I simply ignore the message. The car has no issues cranking, even in very cold weather, so I figure the root cause is an over-conservative computer programmer. My advice is check the battery voltage - should be 12.6V with no load, shouldn't drop lower than about 10V when cranking, and about 13.5V or more when being charged by the alternator. If these readings are OK then you should be fine.
I have to adjust my clock on the car every morning and i cant use the comfort access at times. The message goes away if i drive for a bit but i only have 10 miles to work each way. Should i drive around like a tool so that the battery get charged up, that's stupid..
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      01-16-2014, 02:39 PM   #4
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Simply answer....fully charge the battery, and have it load tested. If it passes the load test, the battery is fine.
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      01-16-2014, 02:44 PM   #5
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Simply answer....fully charge the battery, and have it load tested. If it passes the load test, the battery is fine.
will do..so i guess i need to get a battery charger then. how do i load test the battery? take it to any car parts store? aurzone, pep boys etc..?
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      01-16-2014, 03:39 PM   #6
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Dealer will probably tell you to get a trickle charger. They did for me even though it was my DD. I did a poll about it since I was so surprised. Check out posts 13 & 17.
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