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Hi, I need a little help with a project that I'm currently working on to keep my laptop charged for a minimum of two hours. The plan is to: Use a CCTV power supply to charge a car battery, the car battery then will keep my laptop charged using a universal laptop charger (which converts 12V to 19V). The case now is, my laptop needs 120W and the universal charger provide 90W. Will the 90W charger damage the laptop in any way? Thanks in advance

No. Wattage isn't a concern, amperage is. If your amperage and/or wattage isn't high enough it won't charge the battery. It may not work, but if your research tells you it can be done, then go for it. Worse that happens is you cook the power adapter somehow