Originally Posted by AndreyT

When are you planning to use it in Strobe mode? Daytime? Nighttime?

If you want a marker light for daytime riding, then you are going to have to use it in very bright Strobe mode with high energy consumption. That's just the reality of it, no way around it. Carry spare batteries and recharge more often. (What is "short time" for you is not immediately clear.)

If you want a marker light for nighttime riding, then using high-brigtness Strobe mode is ill-advised. Just get yourself a flashlight which supports regular-brighness blinking mode and use it. In regular blinking modes the battery lasts forever.