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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 12-10-2014, 01:22 PM
theWalkinator theWalkinator is offline
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Location: Philly Suburb
 
Join Date: Dec 2012
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Mein Auto: 2002 BMW 540iA
Replaced battery with Walmart one

So my 2002 540i has this battery drain issue since I bought her, periodically I have to charge it if not used for few of days, winter time is even worse. I thought is was FSU went bad but after shut off the car no fan is running so I didn't replace the FSU.

The car was sitting for 3 days and this morning it won't start, measure the voltage, 10.5v so I finally decided to take the battery out and took to Advance Auto, they said one cell is bad, took to Autozone, they said the battery is not charged enough to test and needs couple of hours charge before they can test, since Walmart is near by, I said to myself, what the heck, just replace it so I got Walmart Maxx EverStar H8 battery which is 900CCA.

Walmart battery measures at 12.3v before install and at 14.2v when car is running after install so alternator is good.

The manufacture date on old battery was 12/11 which is just 3 years old, it is EconoPower made by Interstate, there is no label to tell what CCA is. As far as I know Interstate makes good battery but that bad cell was probably bad already when I bought the car which was less than one year old.

Anyway, replacement is easy except Walmart batter does not come with a vent fitting so I have to fabricate one myself, with a small plastic tube to insert into the Positive post side hole, but there is also a hole on negative post side, should I plug it?

Old Interstate EconoPower battery, the previous owner didn't even hook the batter vent:




Walmart Maxx EverStar H8 battery, 3 year free replacement:
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  #2  
Old 12-10-2014, 02:02 PM
edjack edjack is online now
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Mein Auto: '97 540i 6 speed
A new battery should always be charged for 24 hrs at 10A. They set for months on the shelf. A 12.3 reading means that the battery is about 50% charged.
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Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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Old 12-10-2014, 02:35 PM
theWalkinator theWalkinator is offline
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Quote:
Originally Posted by edjack View Post
A new battery should always be charged for 24 hrs at 10A. They set for months on the shelf. A 12.3 reading means that the battery is about 50% charged.
OK, can I charge in the car with my 6amp charger?
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Old 12-10-2014, 05:34 PM
edjack edjack is online now
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Sure. Best place is under the hood. 6 A will probably do it.
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Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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Old 12-11-2014, 09:48 AM
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bluebee bluebee is offline
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Location: San Jose, California
 
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by theWalkinator View Post
Walmart batter does not come with a vent fitting so I have to fabricate one myself, with a small plastic tube to insert into the Positive post side hole, but there is also a hole on negative post side, should I plug it?
The OEM vent configuration is shown in the pictures in these threads, found by typing /battery f3 in the bestlinks...
- How to choose a good aftermarket battery (1) and a simple battery replacement DIY (1)

See also:
- How to test a BMW battery & alternator (1) & the most often recommended diagnostic procedure to test for overnight parasitic battery drain (1) & one user's attempt to locate, describe, and photograph all fuses and relays in the BMW E39 with a picture of every fuse & relay (1) & how to choose a good aftermarket battery (1) and a simple battery replacement DIY (1) & Cn90's explanation of where to get alternator rebuild parts (1) & how to troubleshoot a bad FSU final stage unit (1) and how to build a test jig for your FSR final stage resistor (1) & how to repair solder cracks in your blower motor resistor (1) & how to replace your HVAC blower motor control (1) (E46) & what FSU is the right one to buy based on user experiences (1)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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Old 12-11-2014, 09:52 AM
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bluebee bluebee is offline
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Location: San Jose, California
 
Join Date: Mar 2008
Posts: 22,012
Mein Auto: 02 BMW 525i M54 auto 130K
This is what happens, if the vent isn't hooked up properly ...

The picture is probably from QSilver7.
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 12-11-2014 at 09:55 AM.
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