Battery

Battery Location

The battery is located on the right side of the trunk under the battery cover.

Battery Specification

Operators manual specifies 12V/95 Ah. Recommended AGM 100 Ah.

Parasitic Draw Testing

1. Close the trunk lock latch to fool the car into thinking that the trunk is closed.

2. Lock the car. If you have keyless-go don't keep receiver close to the car otherwise car might not go to sleep.

3. Using a clamp meter which can measure small current (CEM DT-337 is one of such meters) clamp the positive or negative lead of the battery.

For some time after the car has been locked, the car may consume around 0.5A (500mA).

However, after half an hour, the car should fully go into sleep and should consume around 50mA. The clamp meter is not very precise when measuring very small current, therefore, anything < 100mA is probably fine.

If the battery draw does not drop after half an hour, you may try to remove fuse after fuse until draw drops. Then using fuse charts locate faulty device.

Common sources of parasitic drain

A common source for parasitic drain is navigation device which might not go into sleep if DVD has got stuck or the device have died.

Refereces

Battery Drain Tutorial: http://www.benzworld.org/forums/attachments/w220-s-class/1305786d1422707784-2002-s500-battery-drain-slow-battery-drain-troubleshooting-diy.pdf