My scheme is pretty basic and simple. Don’t charge either the Quattro Storage Case/Charger Li-ion battery or the Quattro’s themselves above ~80% charge.
According to the Android battery monitoring app AccuBattery, if you don’t charge a Li-ion battery above 80%, you double the lifespan of your Li-ion battery. Certain laptop manufacturers such as Lenovo and HP recognize this by, at least on certain laptops, allowing you to set a charging limit when plugged into AC, say, of 80% charged. And Microsoft did the same recently for its Surface devices intended to be used as kiosk devices plugged in all the time by providing a UEFI firmware update allowing one to limit the charging of the built-in Li-ion devices on these expensive premium devices to 50% to help preserve battery lifespan. (even though they’re running on AC, they’re drawing their current through the battery and the AC is just constantly recharging the battery).
So how practical is only charging the Quattro charger and the Quattro HA’s to at most, only 80% (the case has gross % charge LED light display for both the charger battery itself and the HA’s). Don’t know how linear % charge really is in terms of daily battery use but if 100% charge for the Quattro’s is 30 hours, 80% charge should be ~24 hours of battery, more than enough to get through a 16-hour waking day. If the Quattro charger case fully charged provides 3 full charges, 80% charged it should provide ~2.4 full charges to my Quattro HA’s.
So if ReSound expects with full normal charging the HA’s should last at least 3 years (since that’s the typical warranty time), I hope to make my rechargeable Quattro’s last at least 6 years (doubling the expected battery life by not charging above 80%).
Since the new Phonak Marvel premium product only offers at most (with no streaming) a 24-hour battery life, for the sake of experimenting I am simply reducing my Quattro’s to the performance level of a Phonak Marvel. And if all works out as planned, I might be saving a bunch of money along the way until the next big thing in HA’s comes along. What do they say? Idleness is the Devil’s plaything?!
What is missing from my scheme is some metric provided by ReSound to evaluate the current mWh capacity of the batteries involved. For example, my Nikon DLSR in the settings has Battery Info and the camera will display a report from the battery chip as to where the battery stands in its lifespan. Running at an Admin Command Prompt in Windows 10 the command “powercfg /batteryreport” (without the quote) will give you an HTML file on your battery characteristics for your battery-powered device including original stated battery capacity, current battery capacity, and equivalent number of full charge cycles your device has been through, which might help you figure out how much battery lifespan your device has left. I seem to remember that somewhere in iPhone settings on my wife’s iPhone she can get a report in iOS on battery lifespan remaining, too. Both Apple and Microsoft these days say that if you treat your device right, even if you charge it fully, you should be able to go through about 1200 complete charge cycles and have 80% capacity still left (at which point they hope you buy a new device!). So if ReSound did things right, they should also offer a way through the phone app to get a metric on remaining charger and HA battery lifespan.
At any rate, it’s going to take years to see how this scheme works and if it’s too onerous to just charge stuff to ~80% capacity, I may just give up along the way. But I like trying to cheat the battery life tax collector!