This pull implements the api to call the following:
https://wiki.libsdl.org/SDL3/SDL_GetJoystickPowerInfo
https://wiki.libsdl.org/SDL3/SDL_GetJoystickConnectionState
https://wiki.libsdl.org/SDL3/SDL_GetGamepadPowerInfo
https://wiki.libsdl.org/SDL3/SDL_GetGamepadConnectionState

It's worth noting though, the battery info returned from PowerInfo they have on the wiki:
You should never take a battery status as absolute truth. Batteries (especially failing batteries) are delicate hardware, and the values reported here are best estimates based on what that hardware reports. It's not uncommon for older batteries to lose stored power much faster than it reports, or completely drain when reporting it has 20 percent left, etc.

I found this in testing, I tried a wireless steam controller on battery and it did not report any battery percent. Other controllers may though. Even when using the SDL testcontroller it did not report anything.

Testing wired though with the following script works as expected

function love.draw()
    local sticks = love.joystick:getJoysticks()
    for _, stick in ipairs(sticks) do
        local name = stick:getName()
        local id = stick:getID()
        local battery = stick:getDeviceBatteryPercent()
        local power = stick:getDevicePowerState()
        local connection = stick:getDeviceConnectionState()

        love.graphics.print("name: " .. name, 100, 100)
        love.graphics.print("id: " .. id, 100, 120)
        love.graphics.print("battery power state: " .. power, 100, 140)
        love.graphics.print("battery percent: " .. battery, 100, 160)
        love.graphics.print("connection state: " .. connection, 100, 180)
    end
end

I suspect this somewhat resolves #2223