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<E-34> Battery Fill



I'm puzzled.

I checked the acid level in my 525i's battery about 18-months ago.  I fee=
l
certain that the acid in each cell touched the bottom of the "downcommer"=

into which the cap screws.  I checked the level again a couple of days ag=
o.
 All cells were down about 5mm, but still well above the bent-tab low-lev=
el
indicator.  So I refilled each cell with distilled water to the bottom of=

the "downcommer".

The next day a puddle under the car revealed that the battery was lowerin=
g
the level of the acid.  Now, after two days, the level in five of the cel=
ls
is back where it started.  The sixth cell is still full to the bottom of
the "downcommer".

What's going on?  Is the full-level of this battery different from those =
in
my previous experience?  Or????

Any thoughts will be appreciated.

Brant

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