A: There is no seperate replacement battery for these units, this unit is just rechargeable. The Prism tube unit has a 2 hour recording battery life, but you can keep a Sena powerbank on the bike for a quick recharge while riding. The Sena Powerbank is sold seperate and can charge any usb type of device including phones.
Just type in powerbank in the search bar
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Answer provided by: Bart DiMaria (12/27/2016)