The Sennheiser BA 61 is a rechargeable battery pack for the SK 6000 and SK 9000 bodypack wireless transmitters. It provides up to 6.5 hours of operating time on a full charge.
To recharge the BA 61, the L 6000 charger and LM 6061 charging module (both available separately) are recommended. As an alternative, the L 60 charger can also be used.
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The batteries have good longevity considering mine are used daily. I have 12 charged constantly to keep for rotating shifts of talent every few hours for a 24/7 operation. We are tough on them, and we have to pull one battery about every 4-5 months due to being frequently dropped. Otherwise, they keep 75-80% of full capacity even a year after frequent use and recharging.