Powerex PRO AA High Capacity Rechargeable NiMH 1.2V, 2700mAh - 16 Batteries With Holders

After trying several other brands, at Seaside Center for Spiritual Living we've settled on these as the best for using in our Shure wireless mics. Although we change them between our two Sunday morning services, fully charged they typically show 3 out of 5 bars of charge on the receivers after about two hours of constant ON on stage, with maybe 30 minutes total of use each. Used once a week and sometimes more, they seem to last on average about a year before holding enough less charge so we need to replace them. We charge them (32 batteries) in two Tenergy 16-port chargers which have proved bulletproof.