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The keys of most modern cars have internal circuits to control the alarm, windows, trunk opening and also security codes. All these functions included in the key make it nothing more than an electronic product, with the key being just a simple function of this set. In the video we show how to replace the CR2016 or CR2032 battery when it gets weak. The most common symptoms of a weak car remote battery is that the alarm only works when very close or even doesn't work at all. If this happens to your key, it's time to change the battery. Some remotes use the CR2016 battery and others the CR2032 battery. Some use two batteries in series to increase the voltage. You can see in this video how this is done with a battery from a Volkswagen remote. I hope you like it. Electrical installations. In addition to this YouTube channel, you can follow Mundo da Elétrica on social media! Visit the Mundo da Elétrica website: http://www.mundodaeletrica.com.br Like the Facebook page: /mundodaeletrica Follow the Google Plus page: https://plus.google.com/+Mundodaeletr... Follow on Twitter: /mundodaeletrica