The lights mean that your right HA had 60% to 80% charge left when you started charging it, the left had 80% or more charge, which is consistent with your audiogram showing your right needs more amplification, i.e., more charge consumption than your left. The fact that your HA’s were not much discharged means that they probably quickly reached 100% charge and remained at that level as you slept throughout the night. Apple has recognized that having Li-ion batteries sit around at 100% charge is not so great as they have introduced “optimized charging,” which is AI-driven and holds off charging your iPhone, etc., fully until just before the AI figures you’re going to start using your phone again - so it will charge the device to 80%, hold it through the night at 80%, and a sufficient number of hours before it figures you usually get up, charge fully, just before you get up.
They say if you don’t charge over 80%, you DOUBLE the lifetime of the Li-ion battery. Even though you’re streaming 5 hours a day or so, you were consuming less than 40% of your total charge in your daily usage. Perhaps you could replenish the 40% charge consumed in as little as 30 minutes of charging in the morning when you get up, i.e., charge from 40% to 80% each day, and at the end of the day, you’d still have 40% spare charge (12 hours) left in your right HA after discharging during your day’s use. That way, your HA’s would last 4 years, 8 months, instead of 2 years, 4 months (because you’re not going over 80% charge).
If you could program that into your charger so that it did that charging routine to 80% instead of 100% automatically for each HA, even if you put the HA’s into the charger when you went to sleep, things would work great.
That’s what I mean the HA OEM’s are dunderingly behind the times. HP and Lenovo laptops, I’ve heard, have the ability to control the extent to which their batteries are charged and so do electric vehicles. HA OEM’s would rather sell you new batteries when your warranty runs out …
Edit_Update: Exposure to undue heat can also shorten the lifespan of Li-ion batteries. I take it as a follower of the forum that you would not be drying your HA’s in a heated dryer. Leaving them inside a closed up car on summer days would be bad (temp can go up to 135 deg C++ inside a closed car) or in a suitcase in the trunk of a car on a hot summer day in a hot parking lot or sitting on a window sill exposed to direct sunlight, etc. If it’s hot where you live during the summer (as in Texas, Arizona, the Great Inland Empire in S. Cal) wearing the HA’s outside when it’s 100++ deg F for prolonged periods might not be good, either. If it’s just popping in and out of air-conditioned spaces, that’s not going to be a problem.
If you always have your charging case plugged in and charged to 100%, that’s likely to suffer a similar early demise, too. I always use my charging case between 1 light on(just dropping below 2) and 2 lights on (just going to 3rd light coming on), i.e. between ~33% and ~67% charge. It usually lasts me 4 to 5 days before I charge it up again from ~33% to ~67% charge. Usually takes somewhere around 40 min charging the case. You may not want to go to this trouble but I don’t find it a bothersome routine.