The SB910 from Shure is a rechargeable lithium-ion battery for use with the Axient ADX1 Transmitter and the Axient PSM ADXR Receiver. It offers up to 10 hours of runtime with the ADX1 and 5.25 hours of operating time with the ADXR. It is compatible with the SBC240, SBC840, SBM910, and SBRC chargers.
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I like this battery because it's easy and fast to charge, and because it is an intelligent battery, the receiver shows how much time I have before it dies. It has 7+hours fully charged in my ADX1 transmitter, and it takes about 2 hours to charge.