My friend was over working on his 1999 C230. He has a Mercedes battery he got from the dealer about 5 years ago and it is working fine. I suggested he check the water. But it looked like this (picture attached). We contacted the dealer and after much research they stated it is a non serviceable battery. Then I asked about the bullseye indicator (next to the "made in Germany" sticker). I was concerned because it is dark which on some other batteries would indicate low water:

For example this is what Motorcraft says about theirs:

1. Green: battery is charged and the acid level is good.
2. Yellow: Battery is partially dis-charged and the acid level is good. Re-charge the battery or drive the vehicle.
3. Red: Battery is dis-charged and the acid level is good. Charge the battery.
4. Clear and bright: Acid level is low!!! Add distilled water if possible. If not, change out the battery. Do not charge or jump start the battery!!!

However, the dealer stated that dark is OK, and white means it is bad.

The battery PN is A9069820008

Does anyone have experience with these? I am thinking it needs some water.

Thanks

Attached Thumbnails

 

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra