To stay somewhat on topic, I’d say that rechargeable HA’s ought to come with “extra” battery capacity so a BMS (Battery Management System) ought to be able to give you plenty of rechargeable hours while keeping you between 20% and 80% of capacity of the total battery capacity-and the HA OEMs ought to advertise if they’re helping rechargeable users out in that way. And just as for cars, there ought to be a really rapid charging mode as needed but the smartphone app ought to mind the number of fast rechargings you’ve done and encourage you to budget only so many per month.
After the Texas Deep Freeze where we were without power for 2.5 days, when I read about the full-house backup capability of the new Ford F-150 Lightning XLT (150 kWh battery), I decided to spring for that (I’ve always wanted a pickup for all the things I could never fit in a standard sedan to bring home or haul away from my house). But you really don’t get a 300 mile range out of it if you stick between 20% and 80% charge (60% of capacity is only 180 miles) and although you can recharge the 60% capacity in 41 minutes at a DC fast charger, Ford itself advises against doing that too much as it degrades long-term battery lifespan slowly (80% of EV owners recharge at home overnight). OTH, the vehicle weighs 3.25 tons but can do 0 to 60 in 4.4 seconds! (that degrades battery life, too!). And the “frunk” (empty space under hood where a big gasoline motor used to be) can hold 14 cu ft of stuff (up to 400 lbs), as much as the rear trunk in my Accord sedan. To come back on topic, the truck can also deliver 9.6 kW both in 120 V and 240 V AC from its many outlets so wherever I am with the truck, even out in the woods, I can easily recharge my hearing aids, presumably without having to leave the key in the ignition and all sorts of other powered stuff on. As long as electricity is produced from greenhouse gas-producing power plants, though, having a fully electric vehicle is not going to save the planet much. Hopefully, I’ll be consuming greener and greener electricity as time goes by…