Can't you use browserstack for testing? Surely that's more convenient to use.
I’ve been paying 50% for 3+ years now. $40/mo was absurd for my usage but I can stomach $20.
That said I need to reevaluate the space. I’d much rather pay for non-expiring minutes. I just need mobile and desktop manual browser testing with the ability to install apps on the mobile devices and proxy to my local computer. My usage is tiny (0 on average, randomly 60-120min 2-3 months at max).
In our case though the battery temperature can be monitored and this partly lets you know when the battery is going bad before it actually gets to that point and risks catastrophic failure.