We no longer carry EPOS I SENNHEISER battery (6041805), but we found this replacement for you.
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The EPOS Sennheiser SDW Spare Battery is compatible with IMPACT SDW 5066, SDW 5065, SDW 5064, SDW 5063, SDW 5036, SDW 5035, SDW 5034, SDW 5033, SDW 60 HS and SDW 30 HS models. This battery features a capacity of 2.1 WHr.