How to replace backup battery on Roland TD-20 V-Drums Module

Some slightly older units have a fault which causes the backup battery to drain periodically. Roland supposedly fixes the problem for free, but if you want to replace the battery, here are the steps to doing so. Items needed: 1 philips screwdriver 1 tiny flat head screwdriver 1 CR2032 3 Volt Battery 1 soft pad or cloth 1 compact flash card (optional for data backup)