Unlike cheaper versions of this battery is unmatched when charging and in the use of time. While other batteries do not reach more than 4 hours, succeeds at Sennheiser BA 151 battery beyond. Very recommendable products for use on Sennheiser Set 820 S. As hard of hearing I need this unit to the BA 151 rechargeable battery for better speech intelligibility especially in television. Therefore, the battery is worth its price.
