What should I do if the battery is very low? Avoid using the watch below 5% battery.Try not to use the watch when the battery level is below 5%. Related articles How long should I charge the watch? Is there any risk when charging the watch? Can I swim or shower with the watch? Can I see where my child is at all times? Can I use a charger with higher amperage (e.g., 5V/1.5A or higher)?