Your battery might flash for different reasons.
blu 2.0
If you take a single puff lasting 10 seconds or more, the LED will first blink in red with a short vibration, then in amber and blue. Your device will shut down and reset after a few seconds. This feature ensures that the blu 2.0 device stays within normal operating conditions to provide a consistent, quality experience. The LED of the device will also flash six times in red if the device detects a short circuit. If this occurs, your device will reset after a few seconds.
myblu
If your battery flashes 15 times, it means your vape device is being overused and that you should take a break. If your battery flashes 30 times, it needs to be recharged.
If your battery flashes continually, it’s an indication of a problem with the battery’s performance. To fix the issue, try cleaning the battery first.