Yep Same ones I use pure cell and get maybe 2 shoot days per batteriesDo yours use the same 312 "hearing aid" style batteries as mine? If so, those batteries typically only have an effective life in hearing aids of 3-7 days. In my syndicate I shoot every 2 weeks during the season, and if I'm lucky I'll get two shoots worth of use from the CENS before the batteries need replacing. I always use Duracell, and buy mine in bulk from Amazon.
Also any moisture can affect battery life, so I remove the batteries from my CENS between shoots, and leave the little battery door open.
I also remove them post shooting
S