Discharge - Battery Warning alternatives

It’s like the default battery indicator in your menu bar, but cute.

Track battery levels of iPhone, iPad, Apple Watch, and Mac on all your devices. Battery levels sync over the internet. Get low-battery notifications across all your devices. Share and monitor battery levels of friends and family with battery sharing.

Show/hide your Mac's battery icon when you want. With just one click, it shows the battery's health and the statuses of your Bluetooth  products.