312 determines the size: 312 or 312A have exactly the same size and are both mercury-free zinc-air batteries of the same output voltage and capacity. Different manufacturers put letters before or after the "312" to identify their own product numbers.
By GEN on November 19, 2013
I would ask the beltone rep or place you bought them. If they say you need 312 batteries, I would think they would fit. Depending on what size you need (10, 13, 312 etc.) they would work but ask first where you got them.
By G Spera on June 25, 2016