Toshiba LR44 Battery (A76) 1.5V Alkaline Manganese Button Cell, Mercury Free, 1 Battery $0.30 100% Hearing Aid Batteries: Size 13 Duracell Activair 13 Hearing Aid Battery (60 PCS) $21.99 100% Energizer Size 13 EZ Lock & Turn, Zero Mercury Hearing Aid Battery (48 pcs) ...