I’ve worn the resound linx2 9 and 312 batteries for about 1 year … I stream primarily television about 5 to 6 hrs a day and also phone calls occasonally. During that time I had both HA’s replaced, 1st the right one would top streaming and tell me battery was low even if the battries were new…after replacement the same problem changed to the L HA and now I had that one replaced…since replacement they seem to be working well both sides now last about 4 days before low battery alarm starts and tone starts with in hours of each oher