Checking for an LED light is the quickest way to determine if your disposable vape is empty. The battery is dead when the indicator light flashes three to ten times before, during, or after inhalation. Different devices will have different blink rates and light colours. In the absence of a rechargeable disposable, when a gadget stops hitting and begins blinking instead, it is no longer functional and should be discarded. Blinking lights on rechargeable disposables may just indicate a low battery that needs charging. However, if after a recent charge, your device no longer hits (i.e. no vapour is produced), the e-juice in the device has run out and you should get a new one. Other indications are a burnt taste, diminished flavour, and small to no amounts of vapour being produced.