The lifetime of the geko® device is controlled by a clock that runs in the software of the device. We know through extensive testing that at the end of the expiry date the battery has sufficient capacity to operate reliably for 30 hours at the maximum setting. As the battery loses capacity its voltage falls and below a certain threshold the device may not function reliably. To maintain VTE prophylaxis the device needs to be able to operate reliably. A 30 hour life allows for 24 hours continuous operation, with a reserve to give time in which busy staff can change the device and maintain 24 hour VTE prophylaxis.
