OM System BR-404 Ni-MH Rechargeable Battery Set (AAA)

The dictation and voice recorders run on AAA cells, and disposable alkalines get expensive fast for anyone recording daily. The BR-404 is the rechargeable set OM System supplies for them: 1.2V Ni-MH at 750mAh, sized to run a recorder for a full working day.

The low self-discharge rate is the part that matters for this use. A recorder that sits in a drawer between meetings needs cells that still hold charge weeks later, which ordinary Ni-MH does not do well. These can be recharged many times over, which pays back against alkalines within a few months of regular use.