When your Sensors have no batteries, you receive a notification.
In addition, you will see a low battery symbol on your dashboard.
Updated
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<% blocks.forEach(function(block, index) { %>
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<% if (imageHeight) { %>
<% } %> <% if (block.name) { %>
<%= block.name %>
<% } %> <% if (block.description) { %><%= block.description %>
<% } %>
<% }) %>