Changing the key battery. The new battery must comply with the specification of the original battery. › Remove the key bit and partially insert it into the opening. › Press down on the key fob to release the top cover. › Open the battery cover. Troubleshooting. The battery in the key is almost empty. . After pressing a button on the key 3. You turn the key to start and nothing happens. You don't get any lights, beeps, buzzing, clicking or noises from the engine compartment. The basics. You need to get power from the battery to the key switch and when the key switch is turned to the run position, it needs to go out to power the ECU and to your accessories. Skoda Octavia Mk IV (2020 > ) Battery Warning Light. Late 2021 1.5TS Estate. Alarm went off recently that I couldn't stop, it went on for 5 minutes. Dealer workshop guy said probably low battery warning but seemed a bit vague! Checked battery with multimeter, reading 11.95V after standing overnight. Charged it for a few hours until charger 2) DO NOT HANDLE THE BATTERIES WITH YOUR HANDS - this will cause a short and may kill the batteries. 3) Look at the electrical connector at the side and also at the bottom. If the connector is not fully touching the battery, it won't work. Gentle bending of metal to get a better electrical contact. Pull the tab aside and the key blade will slide out. You’ll find a slot on the bottom of the cover the same width as the key blade. Pull the door handle and hold it in the open position, then insert the key blade and use it to pull the cover outwards and off. Release the door handle, then turn the key anti-clockwise to unlock the door. Ur3As.