Hi
What I know is , the smaller the battery is, the shorter lifespan it will be. This 312 has small battery life. The worse it comes is when you use streaming it will drain your battery fast.
I am using RIC hearing aids (nonrechargable), I refuse to use any Bluetooth streaming because of battery life.
This is something audiologist won’t tell you when he/she sells it to you.
I am a longtime BTE wearer. And I am learning more about RIC. I did not know there are so much more about RIC than BTE including maintenance, replacing wire, streaming cause battery life to drain fast (I would recommend rechargeable), replace wax guard (you’ll have to buy it , $5 a box of 8 sticks), I’m sure there are more left that my audiologist did not tell me yet).
I knew about battery life when I was younger- there was this one audiologist who was very kind to offer his opinion that there’s a difference between 312 and 13A.