Keep mobile phones, laptops or tablets fully charged, so you will have use of battery power for a short time at least if there is a power cut.
Cadwch ffonau symudol, cyfrifiaduron côl neu lechi wedi'u gwefru'n llawn er mwyn i chi o leiaf gael pŵer batri am gyfnod byr mewn achos o golli cyflenwad pŵer.