Audeo Marvel M90 - Any Difference between the 312 and 13 version other than battery size and telecoil?

Thanks for the additional info @dondotashe. A typical week day for me is aids in about 0525 and out 2130; weekends vary significantly. But my stats show an average wear time of 13.4 hours/day; it’s only been 9 days with these though and I’ve changed the batteries twice. Right aid has gone first both times, makes sense since that’s my worse ear. My batts that I am using have a date of Oct 2023 on the package. I have my first follow-up with these on Monday morning; am thinking of switching to the size 13 one (was also thinking about asking for the white or black case ones at the same time) but I have another concern that might derail that; will post details in the thread that I’ve been keeping.

I trialed HA with 312 batteries and I would guess that the size 13 would give you at least 25% more life. I am finding that fresh batteries last longer than the ones that have expired. Although the size 13 batteries that have expired on Jan 2020 still give me 60 hours on the average,

I get 5 to 6 days as per battery life on my M90 13’s I guess on average I use my aids 14 hours per day, I do very little streaming apart from maybe a couple of phone calls per day, I always use new batteries that are at least a couple of years prior to expiry date if not longer, you still get the very odd dud, but mostly they are fine… I am using UP Recievers for my severe/profound loss. I did have the M90 R’s but I got them exchanged after a couple of bad experiances out in the sticks when they cut out when fully charged in cold wheather and would not boot up again until placed in the charger pod. Cheers Kev