HGM Microphone Battery - Duracell Medical 76A Price: $2.99 Tweet Recommended battery/replacement battery for use with the Martel HGM-1 Super High-Gain Microphone. Provides more power and a longer life! Medical 1.5 Volt Alkaline Battery 76A - 1 Pack. Replaces PX76A, 675A, A76, LR44, MR44. $2.99 Quantity * Add to cart All AccessoriesAudioMicrophones