https://www.cnet.com/reviews/dyson-v8-preview/
Dyson V8 review: Dyson V8 cordless vacuum doubles battery life, while new Big Ball gets...
Apr 13, 2016 - Dyson V8 cordless vacuum doubles battery life, while new Big Ball gets self-righting powers
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https://www.digitalmatter.com/blog/energy-saving-stack
ESS Doubles Battery Life - Energy Saving Stack for IoT
Boost IoT asset tracking performance with Energy Saving Stack (ess). Get up to 2x battery life, more location updates, and lower TCO - no hardware changes.
doubles batteryenergy saving