This article explains how to replace the CMOS battery in the ECMG4 module
1. Place ECMG4 face down on a protective surface.
2. Remove the 5 screws shown below and lift off cover.
3. The CMOS battery is located beside the RAM memory module.
4. Press the metal tab on side of battery holder to release the CMOS battery.
5. Replace with new 3V CR2032 Lithium Coin battery. Example HERE
6. Place cover back on and replace screws.
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