The best alternatives to Battery Share are Die With Me, FIPLAB, and Batteries. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
FIPLAB is an award winning application development studio in London that specialises in creating intrinsically viral, high quality iPhone, iPad, Mac and Windows 8 applications.
Track batteries of your iPhone, iPad, Apple Watch and Mac at the same time on every device. Battery levels are reliable because it uses tracking tech built into your devices.
Cloud Battery allows you to check battery levels from all your Apple devices in one central place. You can set notifications for each device and use various extensions to know when and what you need to charge. Cloud Battery seamlessly integrates into iCloud for minimal setup and ease of use.
A lightweight, handy utility for battery estimation base on use cases with a revolutionary user experience that has not been made so far. Shiny user interface synchronized with haptic feedback leads to a new relationship between the user and the application.