Discharge Rate (Drain Rate) - Feature Request

[PlayFaster]

Checklist

• I have filled out the template to the best of my ability.
• This only contains 1 feature request (if you have multiple feature requests, open one feature request for each feature request).
• This issue is not a duplicate feature request of previous feature requests.

Is your feature request related to a problem? Please describe.

There is no easy way that I know of to see how fast a battery is discharging "at-a-glance". It can be checked, but its cumbersome and has to be done per battery. There is no easy way to identify batteries that are draining very fast or batteries that are reporting a battery level, but not showing any drain. Maybe the Battery Notes module could provide this?

Describe the solution you'd like

Add a Battery Discharge Rate as an attribute to the Battery Plus sensor please?

• Given average battery life spans for smart home devices, maybe this could be in % per month?
• A linked attribute could be estimated battery run-time remaining, but I'd be delighted just to have discharge rate.
• Discharge or Drain or Use or Usage ... Rate would be possible names for the attribute.

Describe alternatives you've considered

This type of information is also available by

• Using long term statistics graphs
• Creating a template sensor
• Creating a Derivative Sensor Helper
• ???

However, with these methods, a manual effort must be made, for each battery. I do this via LTS graphs for key/high-drain batteries, but it is cumbersome and would take a lot of work to replicate for each battery.

Additional context

I have been really happy with this module for HA, since I saw it highlighted on the BeardedTinker's YouTube channel. So, a big THANK YOU for creating this - it's really really useful, and for me fills a big gap in HA functionality.
I understand that a discharge rate functionality might not be straightforward to implement, but I'm hoping that it is feasible and seen as worthwhile. I would certainly find it a very useful addition. Thanks

[andrew-codechimp]

I have had this suggest before and it will be an interesting one to explore.
Statistics aren't my thing so I'll definitely want some input from yourself/others on what will be useful and methods to calculate it.
I'm moving it to Discussion/Ideas for longer term planning but happy to keep this on the to-do list.