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Loop users should not rely on their Medtronic pump screen's pump battery indicator, and instead use the Loop's pump battery level indicator. in the temperature environment similar to their testing.using Energizer alkaline batteries, and.In summary, that little pump battery indicator on the Medtronic pump screen is ONLY useful if you are: This difference between "failure" voltages needs to be considered when determining how much useful battery life is left for a pump battery. If you experiment with your Looping pump, you'll find Loop will turn red from failed pump comms before the pump actually fails at insulin delivery. So while a non-Looper might be ok running their pump until a voltage of about 1.12 for insulin delivery, radio communications might stop at a voltage output of about 1.17. Those radio communications needs a slightly higher voltage than the typical "normal" pump use. We are also asking for the pump to perform radio communications, in addition to delivering insulin. However, Loop users are slightly more demanding on the pump's battery/voltage than simply delivering insulin. They programmed their pump battery level indicator to change from 4 bars to 3 bars to 2 bars to 1 bar based on that particular discharge curve. In other words, Medtronic ran experiments to see exactly how long an Energizer alkaline battery will last in normal pump use and made their own discharge curve. Medtronic calibrated their pump battery level indicator to: The answer is all about the accuracy of their little pump battery level indicator on their pump's screen. Why would that be? Hint: the answer doesn't mean that Duracell batteries are inherently worse than Energizer or that lithium batteries won't work in Medtronic pumps. If you read Medtronic's literature, it will tell you to use Energizer alkaline batteries in their pumps. So when we talk about setting alarm levels in either system, your battery type is an important consideration. You might only get a couple of hours of looping left when a lithium battery is at 1.3v, but an alkaline battery at 1.3v might go for several more days. What does the above information mean in terms of Looping? A lithium battery at 1.3v is going to have a much quicker time to death than an alkaline battery sitting at 1.3v. Notice how the shape of the curve is relatively flat for a large portion of the battery life before suddenly off around 1.3 volts. Lithium batteries have a much steadier voltage output over time, as shown below. Notice the shape of the curve has a significant amount of time in the 1.3 to 1.2 volts range, and a relatively smooth decline to about 1.2 volts. BUT, alkaline batteries and lithium batteries have different discharge curves due to the chemistry inside them, and the curves can be slightly different depending on the environment (temperature) and battery manufacturer.Īlkaline batteries have a relatively steady voltage drop over time, as shown below. Batteries start at a higher voltage output and slowly that voltage output degrades over time (or use) until the battery no longer provides enough "ummph" to keep the electronic gadget going. More technically said, a battery discharge curve is the measure of volts that a battery puts out over time. It's not a hard concept.basically how a battery dies over time as it is used or sits in a drawer. To understand pump battery levels, you first need to know a little about battery discharge curves. There are generally two different types of AAA batteries that we use in these Medtronic pumps alkaline or lithium.
#Energizer batteries feature how much battery life remaining how to#
One common confusion point for new Loop users is how to interpret their pump's battery levels and whether they need to change their pump batteries based on which pieces of information.