With Seemee 100, 180 and 200 bike tail lights. Constant and most flash modes will only last 1.5 to about 3 hours. Only certain the flash patterns can last longer than that. Also having the brake sensor active on a busy road will likely run down the battery as well. For maximizing runtime on your Seemee 100, 180 and 200, please consider turning the brake sensor off and use either the Interactive or the Flash patterns.
To turn on/off the brake sensor: With the light off, press and hold the power button. The light will come on, ignore it. At the end of the 5th second you might notice a change in light pattern. If the light on constant after 5 seconds= brake sensor turned ON. Fast flashes after 5 seconds= brake sensor turned OFF.
Please note: double pressing the power button will switch between the 3 main lighting modes, CONSTANT, FLASH and SMART modes(in that order). Single press to cycle options within the mode, this will cycle brightness under CONSTANT, and flash patterns under FLASH. Under SMART mode, single press does nothing as there are no additional options. The light sensor in this mode works automatically based on ambient light. It is not considered one of the main flash modes. The SMART mode can last up to 3 hours at night and way longer during the day.
When the light is on CONSTANT mode, double press to enter FLASH mode, under which, single press to cycle between the 4 main flash patterns, Breathe, Comet, Flash, and Interactive(in that order.) Breathe and Comet are slow and gradual patterns, fading in and out, lasting in the neighborhood of 2-3 hours, while Flash and Interactive are fast and instant, offering longer runtime on Seemee 100, 180 and 200 models.
